General description High Speed Steel Drill Bits set consisting of 7 pieces, designed for drilling holes in smaller hinges for carpentry, cabinet making, furniture projects, and other woodworking or hardware applications such as decorative boxes. The drill bits feature a self-centering design for precise hole placement. Technical specifications Sizes: 5/64", 7/64", 9/64", 11/64", 5mm, 13/64", 1/4" Drill shank diameter: 1/4" inch Hole cutting diameters: 5/64": approximately 2mm, suitable for 2.2-3.2mm self-tapping screws 7/64": approximately 2.8mm, suitable for 3.0-3.5mm self-tapping screws 9/64": approximately 3.5mm, suitable for 4.0-4.5mm self-tapping screws 11/64": approximately 4.5mm, suitable for 5.0-5.5mm self-tapping screws 5mm: approximately 5mm, suitable for 5.5-6.0mm self-tapping screws 13/64": approximately 5.1mm, suitable for 5.6-6.0mm self-tapping screws 1/4": approximately 6.3mm, suitable for 6.8-7.3mm self-tapping screws Other information High hardness, rust-proof, strong