Updated March 2026 | By ToolShed Tested Team
Quick Answer: Use a drill/driver for boring holes and delicate screw-driving where you need clutch control. Use an impact driver for driving long screws, lag bolts, and removing stubborn fasteners—it delivers far more torque without the wrist strain. If you can only buy one tool, start with a drill/driver; add an impact driver second.
Two Tools, Two Jobs
Drills and impact drivers look similar and both turn fasteners, which creates endless confusion. But they work differently under the hood, and each excels at different tasks. Understanding the distinction will make you faster, more precise, and easier on your joints.
How a Drill/Driver Works
A drill/driver uses a standard chuck that accepts round and hex-shanked bits. It delivers continuous rotational force through a gearbox. The adjustable clutch lets you set a torque threshold—the clutch slips when the screw reaches the desired depth, preventing over-driving.
Key features:
- Adjustable clutch (15-25 settings)
- Two-speed gearbox
- 3/8″ or 1/2″ keyless chuck
- Accepts all drill bits and driver bits
How an Impact Driver Works
An impact driver uses a 1/4″ hex collet (not a chuck) and delivers torque through rapid concussive rotational blows—typically 3,000-4,000 impacts per minute. When it senses resistance, the impact mechanism kicks in, multiplying torque dramatically without transferring the reaction force to your wrist.
Key features:
- No clutch (some models have electronic speed modes)
- 1/4″ hex quick-release collet
- Compact and lightweight
- Very high torque output (1,200-2,300 in-lbs)
When to Use Each Tool
| Task | Drill/Driver | Impact Driver |
|---|---|---|
| Drilling holes in wood, metal, plastic | ✔ Best | ✖ Not ideal |
| Boring large holes (hole saws, spade bits) | ✔ Best | ✖ Can’t use |
| Driving short screws (cabinets, drywall) | ✔ Best (clutch control) | Works (risk of over-driving) |
| Driving 3″+ deck/construction screws | Struggles | ✔ Best |
| Lag bolts and large fasteners | ✖ Too weak | ✔ Best |
| Removing stuck/rusted fasteners | ✖ Stalls | ✔ Best |
| Delicate work (electronics, thin wood) | ✔ Best (low clutch) | ✖ Too aggressive |
If You Can Only Buy One
Buy a Drill/Driver If:
- You’re a homeowner doing varied tasks
- You drill holes as often as you drive screws
- You work with delicate materials that need clutch control
- You’re building your first tool collection
Buy an Impact Driver If:
- You rarely drill holes (or own a separate drill)
- Most of your work is driving screws and fasteners
- You do deck building, framing, or construction
- Wrist fatigue is a concern
The Best of Both Worlds
Most major brands sell drill/impact combo kits with two tools, two batteries, and a charger. These are almost always a better value than buying each tool separately. If you’re starting a battery platform, this is the smartest first purchase.
Common Misconceptions
- “Impact drivers drill holes.” Technically they can spin a drill bit, but the impacts create slightly out-of-round holes and can break small bits. Use a drill for holes.
- “Drills have enough torque for anything.” A standard drill maxes out around 700 in-lbs. Long construction screws and lag bolts need more—that’s where the impact driver shines.
- “Impact drivers are louder.” True—the impacts create a distinctive rapid hammering sound. Hearing protection is recommended.
FAQ
Can an impact driver strip screws?
Yes, if you use the wrong size bit or cheap fasteners. The high torque can cam out of a Phillips head. Use impact-rated bits and star-drive screws when possible.
Do I need special bits for an impact driver?
Yes. Use impact-rated (black or dark-colored) bits. Standard chrome bits can shatter under the concussive force. Impact bits are made from softer steel that flexes instead of breaking.
Why does my impact driver have speed modes?
Speed modes limit the RPM and impact force, giving you some of the clutch-like control that a drill has. Use the lowest mode for short screws in soft material, and full power for heavy fastening.
Is a hammer drill the same as an impact driver?
No. A hammer drill delivers impacts along the axis (forward and back) to break through masonry. An impact driver delivers rotational impacts (around the axis) to drive fasteners. Completely different mechanisms for different jobs.