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You are buying a kit. It comes with two tools that look exactly the same. One has a fat nose (Drill). One has a hex nose (Impact Driver). Which one do you use?
Here is the flowchart.
1. The Drill / Driver (The Generalist)
- What it does: It spins smoothly. It has a “Chuck” (the black twisting mouth) that opens and closes to hold any shape bit.
- Use it for: Drilling holes.
- Do NOT use it for: Driving long screws. It will twist your wrist and strip the screw head.
2. The Impact Driver (The Specialist)
- What it does: It spins, but when it meets resistance, it starts hitting (impacting) inside. It’s like a wrench banging on the screw 3,000 times a minute.
- Use it for: Driving screws, lag bolts, and nuts.
- Why: The impacting action does the work for you. You can drive a 6-inch screw with two fingers. It never strips the screw.
- The Flaw: It is loud. It cannot hold round drill bits (unless you buy special hex-shank ones).
3. The Hammer Drill (The Concrete Destroyer)
- What it does: It is a standard drill, but it has a “Hammer Mode.” It punches the drill bit forward and backward while spinning.
- Use it for: ONLY Brick, Concrete, and Stone.
- Warning: Never use “Hammer Mode” on wood. You will destroy the wood.
The Simple Rule:
- Making a Hole? Use the Drill.
- Driving a Screw? Use the Impact Driver.
- Drilling Concrete? Use the Hammer Drill.