Feature: Accurate positioning, will not shift, wood chips will be automatically discharged from the hole on both sides of the hole, will not die bit. 100% brand new and high quality. Material: Brass+High speed steel+Surface plating. Size: 5/64", 7/64", 9/64", 11/64" Hole Size Diameter: 5/64": the hole diameter is about 2mm, the use of 2.2-2.8mm self tapping screws; 7/64": the hole diameter is about 2.8mm, the use of 3-3.5mm self tapping screws; 9/64": the hole diameter is about 3.5mm, the use of 4-4.5mm self tapping screws; 11/64": the hole diameter is about 4.5mm, the use of 5-5.5mm self tapping screws; .