It is a set of professional drilling tools, applicable to the installation of the door hinge. 7 sizes used replacement for carpenters, cabinet, furniture makers, and other woodworking trades. High hardness, durable and drilling performance. Features -Color: Assorted Color -Material:High-speed steel - Dimensions: 5/64 ", 7/64", 9/64 ", 11/64", 13/64 ", 5 mm, 1/4" - Made of High-speed steel material, durable and practical. - One drill bit can open a variety of sizes, can complete the function that the normal drill can't such as deburring, chamfering, and reaming. - Suitable for DIY, Home and General Building, Engineering Using. - and , performance and cutting strength. - For precise drilling and positioning of handles on doors, flaps and drawer fronts. Specifications - 5/64'': Hole diameter is about 2 mm, Use about 2.2 - 2.8 mm tapping screw. - 7/64'':Hole diameter is about 2.8 mm, Use about 3 - 3.5 mm tapping screw. - 9/64'':Hole diameter is about 3.5mm, Use about 4 - 4.5 mm tapping screw. - 11/64'':Hole diameter is about 4.5mm, Use about 5 - 5.5 mm tapping screw. - 5mm: Hole diameter is about 5mm, Use about 5.5 - 6 mm tapping screw. - 1/4" : Hole diameter is about 6.35mm, Use about 7 - 7.5 mm tapping screw. Package list: 7 x drill bits 1 x wrench