7pcs 1/4" hex shank Self-Centering hinge drill bit,6pcs 1/4" Hex Shank HSS 5 Flute 90 Degree Countersink Drill Bits and 1pcs Automatic Center Punch

Specification: Length: 1.88" / 48 mm Angle: 90 degrees Surface treatment: titanium coating Dimensions: 1/4" (6mm), 5/16" (8mm), 3/8" (9mm), 1/2" (12mm), 5/8" (16mm), 3/4" (19mm) handle Size: 1/4" (6.35mm) hex shank Material: high speed steel 1/4" Hex shank HSS 5 flute countersunk 90 degree center punch tool set for wood fiberboard and plastic sheet 7 most common sizes 5/64" 7/64" 9/64 "11/64" 25/127 "13/64" 1/4" self-centering drills for woodworking, cabinets, furniture manufacturers and others Drill bits for the woodworking industry Common size description: 5/64": hole diameter approx. 2 mm, using approximately 2.2 - 2.8 mm tapping screws 7/64": hole diameter approx. 2.8 mm, using approximately 3 - 3.5 mm tapping screws 9/64": hole diameter is approximately 3.5mm, using approximately 4 - 4.5 mm self-tapping screws 11/64": hole diameter approx. 4.5mm, using approximately 5 - 5.5 mm self-tapping screws 5mm: The hole diameter is about 5mm, and about 5 - 5.5 5.5-6mm self-tapping screws are used 13/64": hole diameter is about 5.2mm, use about 6 - 6.5 mm self-tapping screws 1/4": hole diameter is about 6.35mm, using about 7 - 7.5 mm self-tapping screws Note: Please adjust according to the hardness of the wood when opening If the wood is soft, you can choose a smaller size If it is hardwood, choose the corresponding or larger size