[Precision Self-Centering Design]Automatically aligns to the center for perfectly straight hinge screw holes every time. No slipping or misalignment-ideal for door hinges, cabinet hardware, and window fittings [High-Quality Materials]Features a solid brass shell for durability and high-speed steel (HSS) drill core for superior hardness & long-lasting performance. Electroplated finish resists rust and wear [8 Size Options]Includes 5/64", 7/64", 9/64", 11/64", 13/64", 5mm, 1/4" bits-covers all standard hinge screw sizes (2mm to 7.5mm self-tapping screws), with a hex key to meet your needs [Efficient Chip Removal]Dual-side vent holes allow wood chips to eject automatically, preventing clogging and ensuring smooth, fast drilling [Versatile Use]Perfect for woodworkers, carpenters, and DIYers installing doors, windows, cabinets, and furniture. Adjust bit size based on wood hardness (softer wood = smaller bit; harder wood = larger bit) Color: As Shown Material: Metal Package Contents: 1*17PCS Self Centering Drill Bit Set