If you have just invested in your first serious DeWalt 18V XR kit, you now have two similar looking, but radically different, yellow and black tools: the DCD776 Combi Drill and the DCF787N Impact Driver.
If you are asking, “Do I really need both, and which one is which?” you’re not alone. This is the single most confusing choice for anyone moving up from owning a basic household drill. It certainly was for me when I started out.
The short answer is: Yes, you absolutely need both. The DCD776 is primarily for making holes, and the DCF787N is for driving screws and fasteners. Trying to swap their jobs will only end in ripped screw heads, damaged wood, or a very tired wrist.
Here is the definitive guide to understanding your essential DeWalt starter kit and maximising its power in the UK home and workshop.
The Essential Differences at a Glance
Though they both run on your 18V XR batteries, the DCD776 and DCF787N are built for fundamentally different tasks. Understanding these differences is the key to faster, cleaner work
Feature | DeWalt DCD776 Combi Drill DeWalt DCD776 Combi Drill | DeWalt DCF787N Impact Driver DeWalt DCF787N Impact Driver |
|---|---|---|
Primary job | Drilling (wood, metal, masonry) & Precise Driving of short screws. | Driving screws, bolts, and long fasteners |
Chuck/Holder | 13mm Keyless Chuck (Accepts round drill bits) | ¼ inch Hex Chuck (Accepts only hex shank bits) |
Action | Rotary & Hammer (for brick/block/masonry) | Rotary & Impacting (rotational bursts of power) |
Torque/Control | Lower (65 Nm Max) & highly Controlled by the Clutch | Higher (170 Nm Max) & Uncontrolled (Drives until the screw stops) |
Size & Weight | Slightly longer and heavier | Shorter and more compact |
Why the DCD776 Combi Drill is Indispensable
The DCD776 is your true all-rounder and the starting point for nearly every project. It excels at precision and versatility.
1. The Clutch: Precision Driving
The most crucial feature of the DCD776 is the adjustable clutch (this is the numbered dial behind the chuck). This mechanism allows you to set a torque limit.
Real-World Use: When driving screws into delicate materials like plasterboard or cabinet hinges, the clutch will click and disengage once the screw reaches the desired tightness. This prevents you from overdriving the screw, stripping the head, or cracking your material.
2. Drilling Holes
The DCD776 uses a traditional chuck that can grip any round-shank drill bit. It also features a hammer function (the hammer icon on the collar) which provides a percussive action essential for drilling clean holes into common UK brickwork and concrete block.
- Note: The hammer action is excellent for home DIY, but if you need to tackle heavy-duty concrete or structural walls, you’ll need an SDS Plus drill.
3. My Experience
Compared to other cheaper branded drills I have owned, this DeWalt model is just so much better. It feels better in your hand, has a really nice balance and all of the controls are very simple to understand and use.
I use the 1.5AH battery and it lasts long enough to do any basic job. On longer jobs it lasts for around 1.5-2 hours of constant use. I also use this with the small adapter (DeWalt DT7701QZ 80ml Screwdriving Guide) which makes changing driving bits really fast and easy. You can also use this adapter in your impact driver, if you don’t want to buy impact driver bits.
Why the DCF787N Impact Driver is a Time-Saver
The DCF787N is pure, brutal efficiency. If the combi drill is a surgeon, the impact driver is a heavy construction worker.
1. The Impact Action
The DCF787N delivers short, rapid rotational blows (the “impacts”) once it meets resistance. This action accomplishes two vital things:
- Zero Kickback: It takes the strain off your wrist, allowing the tool to sink long screws (like 100mm decking screws) deep into dense wood without winding up and twisting your hand. Also great for fencing.
- Prevents Cam-Out: The high, sudden torque keeps the bit firmly seated in the screw head, virtually eliminating cam-out (the bit slipping out of the screw head). This saves you from damaging screws and your hex bits.
2. Speed and Power
With up to 170 Nm of torque, the DCF787N is a powerhouse designed for one thing: getting fasteners in fast. It’s essential for large projects like decking, fencing, stud walls, and roof repairs. You will never want to drive a long screw manually with the DCD776 once you’ve felt the speed of the DCF787N.
- Crucial Tip: The DCF787N only accepts ¼ inch hex shank bits. You must use impact-rated hex bits (often gold or black) as regular bits will snap under the impacting force.
3. My Experience
I never quite understood the difference in power between a cordless drill/driver and an impact driver until I started to use it. It is really noticeable. Take something like a 50mm long screw (2″) and try both the drill and the impact driver to screw it into any piece of wood.
Both will do the job, but, the impact driver completes this quickly and easily. It is literally day and night in terms of power and speed.
Making the Most of Your DeWalt Starter Kit
For the UK DIYer, the combination of the DCD776 and the DCF787N is perfect because it allows you to set up two tasks simultaneously.
- The Workflow: Leave a pilot bit in your DCD776 drill/driver and a screwdriving bit in your DCF787N impact driver. You can drill your hole with one tool, immediately swap to the other, and drive the screw. No more fumbling with changing bits in a single chuck.
Your Essential Upgrade Path
The DCD776/DCF787N kit and most starter kits come with the smaller DCB181 (1.5Ah) or DCB183 (2.0Ah) batteries. While adequate for light DIY, the high torque of the impact driver will drain these quickly on big jobs.
Your first necessary upgrade should be a higher capacity battery to match the power of the DCF787N:
- Upgrade Recommendation: Invest in a DeWalt DCB184 (5.0Ah) battery. This will massively increase the run time and overall power delivery of your DCF787N, turning it into a true workhorse.
The Verdict
The DCD776 Combi Drill and the DCF787N Impact Driver are not competitors but are in fact are very good partners. The Combi Drill provides the necessary control and versatility, and the Impact Driver provides the overwhelming power and speed.
If you bought the twin kit, you made the right decision.