Hinge Drill Bit Kit, Black Hinge Drill Bits Reaming Drilling Wood Hex [Choice] There are 5mm and 1/4inch drill bits that you can choose for drilling holes in different sizes.[Wide Application] These hinge jaws can reliably and accurately center holes for mounting hinges and other types of hardware. Widely used on wood and plastic, the chip will be automatically removed from these two side holes.[Features] It removes material from the edge of the hole, cutting out a disc of material. Perfect for installing locks, knobs in doors and cabinets or drilling larger diameter holes through desks, etc. [Safe and Durable] Sharp and anti-cut gears with reduced consumption make the product has a long service life, 4241 high speed steel drill bit is sharper and traditional than durable and practical. Specifications: Material: 4241 high speed steel, brass Color: as picture Drill Bit Size: 1/4'', 5mm (optional) Hex Shank Size: 1/4''