Combi Drills

About Combi Drills

Combi drills represent one of the most versatile and essential power tools for both professional tradespeople and DIY enthusiasts across the UK. Combining three key functions in a single compact unit - rotary drilling, hammer drilling, and screwdriving - these machines have become the go-to choice for anyone needing a reliable, multi-purpose drilling solution. The ingenious design allows users to switch seamlessly between standard drilling in wood, metal and plastic, hammer action for masonry work, and precision screwdriving with adjustable torque control.

Modern cordless combi drills have evolved significantly, with brushless motor technology, high-capacity lithium-ion batteries, and intelligent power management systems delivering performance that rivals corded alternatives. Available in various voltage platforms from compact 10.8V models for tight spaces through to powerful 18V workhorses, there's a combi drill suited to every application. Leading manufacturers including Bosch, DeWalt, Makita, Black & Decker and Einhell offer extensive ranges spanning entry-level DIY models through to professional-grade machines built to withstand daily site work.

The adjustable torque clutch is a defining feature, enabling precise control when driving screws into different materials without stripping heads or damaging surfaces. Combined with variable speed triggers and hammer action that can be engaged for drilling into brick, concrete and blockwork, a quality combi drill eliminates the need for multiple separate tools, saving both money and valuable toolbox space.

Jargon Buster

• Brushless Motor: Advanced motor technology that uses electronic circuitry instead of carbon brushes, delivering improved efficiency, longer runtime, reduced maintenance, and extended tool lifespan compared to traditional brushed motors.
• Torque Settings (Clutch): Numbered ring on the collar that adjusts how much rotational force is applied before the clutch slips. Lower settings for delicate screws in soft materials, higher settings for larger fixings or drilling operations.
• Ah (Ampere-hour): Battery capacity measurement indicating how much charge a battery holds. Higher Ah ratings (e.g., 4.0Ah, 5.0Ah) provide longer runtime between charges, though they add weight to the tool.
• Nm (Newton-metres): Unit measuring the torque output of the drill. Higher Nm values indicate more powerful drilling and driving capability, with DIY models typically offering 30-50Nm and professional tools reaching 80Nm or more.
• Hammer Action: Percussive drilling mode that delivers rapid forward impacts alongside rotation, essential for drilling into masonry materials. Measured in impacts per minute (IPM).
• Chuck Size: The maximum drill bit shank diameter the chuck can accept, typically 10mm or 13mm on combi drills. Larger chucks accommodate bigger bits for drilling wider holes.

Who Uses Combi Drills?

Combi drills serve an exceptionally broad user base across the UK construction and DIY sectors:

• General builders and contractors rely on combi drills daily for fixing, fastening and drilling across multiple materials on site
• Electricians (sparkies) use them extensively for drilling cable routes, fixing back boxes and mounting electrical fittings
• Plumbers for pipe bracket installation, fixing radiators and general mounting work
• Carpenters and joiners (chippies) for both wood drilling and driving screws in joinery applications
• Kitchen and bathroom fitters who need versatile drilling for unit installation across various substrates
• Shop fitters and shopfitters for display and fixture installation work
• Maintenance engineers across facilities management requiring a portable, multi-purpose drilling solution
• DIY homeowners tackling flat-pack furniture assembly, shelving installation, picture hanging and home improvement projects
• Handyman services needing reliable, versatile tools for varied repair and installation jobs

How to Choose the Right Combi Drill

Voltage Platform: 10.8V-12V models offer exceptional portability and are ideal for overhead work, confined spaces, and lighter applications. They're perfect for electricians working in ceiling voids or anyone prioritising minimal weight. 18V combi drills deliver substantially more power and are better suited to regular drilling in masonry, driving long screws, and demanding site work. Consider your typical applications when selecting voltage.

Brushless vs Brushed Motors: Whilst brushed motor drills cost less initially, brushless models offer superior efficiency, translating to approximately 25-30% longer runtime per charge, increased power output, and significantly extended tool life with virtually no maintenance. For professional users, the investment in brushless technology pays dividends through reduced downtime and battery costs.

Torque Output: Entry-level DIY combi drills typically offer 30-40Nm, adequate for general household tasks and occasional use. Mid-range models deliver 50-60Nm for more demanding DIY and light professional work. Professional-grade machines reach 80Nm or higher, handling large masonry bits and driving substantial fixings without stalling.

Battery Capacity: Consider both the Ah rating and number of batteries included. A 2.0Ah battery suits occasional users prioritising light weight, whilst 4.0Ah or 5.0Ah batteries better serve professionals needing extended runtime. Many professional tradespeople invest in additional batteries to maintain continuous productivity on site.

Build Quality and Brand: Professional brands like Bosch Professional, DeWalt, Makita and Festool engineer their tools for daily site abuse with robust housings, metal gearboxes and comprehensive warranties. DIY-focused brands including Bosch DIY, Black & Decker and Einhell offer excellent value for lighter-duty applications and occasional use.

Kit Contents: Bare units suit those already invested in a battery platform, whilst complete kits including batteries, charger and case offer better value for first-time buyers or those starting a new voltage system.

Popular Accessories

• Drill Bit Sets: HSS bits for metal drilling, wood bits including brad point and auger patterns, and masonry bits with carbide tips for brick and concrete work
• Screwdriver Bit Sets: Phillips, Pozi, Torx and hex driver bits in various lengths, including impact-rated bits for demanding applications
• Spare Batteries: Additional battery packs in various capacities to maintain productivity and minimise charging downtime on site
• Quick-Change Chuck Adaptors: Enable rapid bit changes without manually opening the chuck, significantly speeding up workflow when alternating between drilling and driving
• Drill Bit Sharpeners: Extend the life of HSS bits through periodic resharpening, reducing consumable costs
• Magnetic Bit Holders: Extend reach and hold screws magnetically for one-handed operation in awkward locations
• Tool Cases and Organisers: Protect your investment and keep batteries, chargers and accessories organised for transport between jobs

Safety Information

When operating combi drills, always wear appropriate eye protection to guard against flying debris, particularly when drilling masonry or metal which can produce sharp fragments. Safety glasses or goggles meeting BS EN 166 standards provide essential protection.

Remove jewellery, secure loose clothing and tie back long hair before operation to prevent entanglement. When drilling overhead, wear a dust mask or respirator (minimum FFP2 rated) to avoid inhaling particulates, particularly when working with masonry which generates silica dust - a substance regulated under COSHH (Control of Substances Hazardous to Health).

Always check for hidden cables, pipes and services before drilling into walls, ceilings or floors. Cable and pipe detectors are essential safety equipment, especially when working in occupied properties. Ensure workpieces are securely clamped where possible rather than hand-held.

Inspect drill bits before use and discard any that are damaged, bent or excessively worn. Damaged bits can shatter during operation or cause the drill to snag dangerously. When working at height, use appropriate access equipment meeting HSE guidance and wear a tool lanyard to prevent dropped tools causing injury below.

Frequently Asked Questions

What's the difference between a combi drill and an impact driver?

A combi drill offers three functions - drilling, hammer drilling and screwdriving - with an adjustable clutch for precise torque control. An impact driver is specifically designed for driving screws and bolts, using rotational impacts to deliver much higher torque without the adjustable clutch. For most users, a combi drill provides greater versatility, though many professionals use both tools for different applications.

Can I use my combi drill for mixing paint or plaster?

Whilst technically possible with a paddle mixer attachment, combi drills aren't ideal for sustained mixing applications. The high resistance encountered when mixing heavy materials can overheat the motor and drain batteries rapidly. For regular mixing work, a dedicated mixer tool with appropriate power and gearing is recommended to avoid premature wear on your combi drill.

How long do combi drill batteries last?

Lithium-ion batteries typically maintain good performance for 300-500 charge cycles before capacity begins declining noticeably. With proper care - avoiding complete discharge, storing at moderate temperatures and using regularly - batteries often provide 3-5 years of reliable service. Brushless motor drills extract more runtime per charge, maximising battery value.

What size combi drill do I need for drilling brick and blockwork?

For drilling holes up to 10mm in brick and blockwork, a quality 12V combi drill with hammer action suffices for occasional use. However, for regular masonry drilling, particularly holes larger than 10mm or working in hard engineering brick, an 18V model with at least 50Nm torque and a 4.0Ah battery provides much better performance and reduced user fatigue.

Are cheaper DIY combi drills worth buying?

For occasional home use - assembling furniture, hanging pictures, light drilling - budget-friendly models from brands like Black & Decker, Einhell or Bosch DIY offer excellent value and perfectly adequate performance. However, if you're using the tool regularly or for demanding applications, investing in professional-grade models from Bosch Professional, DeWalt or Makita delivers superior durability, power and long-term reliability that justifies the higher initial cost.