Brass housing, high-speed steel drill core
Accurate positioning, will not shift; wood chips are automatically discharged from the holes on both sides of the top of the drill bit, preventing drill jamming.
Plating
5/64'': Hole diameter approximately 2mm, suitable for self-tapping screws around 2.2-2.8mm
7/64'': Hole diameter approximately 2.8mm, suitable for self-tapping screws around 3-3.5mm
9/64'': Hole diameter approximately 3.5mm, suitable for self-tapping screws around 4-4.5mm
11/64'': Hole diameter approximately 4.5mm, suitable for self-tapping screws around 5-5.5mm
5mm: Hole diameter approximately 5mm, suitable for self-tapping screws around 5.5-6mm
13/64'': Hole diameter approximately 5.2mm, suitable for self-tapping screws around 6-6.5mm
1/4'': Hole diameter approximately 6.35mm, suitable for self-tapping screws around 7-7.5mm

