Description: Made of high speed steel drill bit, High hardness, durable and drilling performance. Size of center drill bit -- different sizes: 5/64', 7/64'', 9/64'', 11/64'', 13/64'', 5mm and 1/4". With 1 Hex key. HIGH ACCURACY & EFFICIENCY -- Automatic positioning center enhance accuracy and efficiency. Double-sided hole design - fast & automatic discharge Sawdust from the hole on both sides. MULTI-APPLICATIONS -- Highly accurate bits are used for drilling exact pilot holes in cabinet and door hinges, door butts, handles, drawer slides, woodworking, and more. Standard 1/4" hex shank fits all power bit and quick-change chucks. EASY TO USE -- The self-centering drill set offers quick bit changes without re-chucking or the need for tools. Fast, one-handed load and release. Specification: Material:Electroplate aluminum shell, high speed steel core, iron hexagonal handle Color: Silver Package Includes: 8/9Pieces Hinge Self Centering Drill Bit Set Note: Due to the difference between different monitors, the picture may not reflect the actual color of the item. Due to manual measurement, there may be 1-2mm error in size.