1The yellow tip is made from high quality brass which is wear-resistant, rust proof and durable 2High speed steel 4241 drill bit is sharper and has a longer service life than traditional one 3These hinge bit can reliably and accurately center the holes for mounting hinges and other types of hardware 4Widely used on wood and plastic, chip will be removed automatically from these two side holes 5There are 5mm and 1/4inch drill bits that you can choose for boring holes in different sizes Features: The yellow tip is made from high quality brass which is wear-resistant, rust proof and durable. High speed steel 4241 drill bit is sharper and has a longer service life than traditional one. These hinge bit can reliably and accurately center the holes for mounting hinges and other types of hardware. Widely used on wood and plastic, chip will be removed automatically from these two side holes. There are 5mm and 1/4inch drill bits that you can choose for boring holes in different sizes. Specifications: Material: High speed steel 4241, brass Color: As picture Drill Bit Size: 1/4'', 5mm(Optional) Hex Shank Size: 1/4'' Package Includes: 1 x Hinge Drill Bit