Material: High Speed Steel
Standards: 5/64", 7/64", 9/64", 11/64"
5/64 inch: about 2.2-2.8mm opening diameter using self-tapping screws
7/64: about 2.8mm opening diameter using 3-3.5mm self-tapping screws.
9/64: about 3.5mm opening diameter using 4-4.5mm self-tapping screws.
11/64: about 4.5mm opening diameter using 5-5.5mm self-tapping screws
How to use: Use L-shaped wrench to secure the drill before use. The opening diameter can be adjusted according to the hardness of the wood, if the wood is soft, please choose the smaller size, even if the wood is hardwood, please choose larger size.
Features: Positioning, wood shavings can be automatically removed from the tip of the drill.
Package: 1 set (4 pieces)