7pcs Self-Centering High Speed Drill Bits for Hinge Door Hinge Door Gate Features: 1. Effortlessly Drill Accurate Holes Self-centering bits make accurate drilling quick and easy. Save time and energy by effortlessly creating perfectly centered holes. 2. Drill accurate, well-centered holes every time with self-centering bits. Work smarter and increase productivity with precise, accurate drilling. 3. Create Perfectly Centered Holes: The self-centering bit is built with a spring-loaded guide that centers the bit. The spring-loaded guide inside the bit creates precise positioning - every time. 4. 7 Drill Bits Included, Versatile Size: The self-centering drill bits come in 7 different sizes, ensuring you always have the right size drill bit for every job. With perfectly aligned positioning, you'll create a clean, professional-looking product. 5. Precise, Reliable, and Built to Last: Made of carbon steel and aircraft-grade aluminum, the drill bits are durable, strong, and built to withstand extended use. The drill bits are perfect for installing door hinges, cabinets, drawers, and more. Notes: 1. Actual color may be slightly different from the image due to different monitor and light effect. Please allow slight deviation due to manual measurement. Specifications: Material: Brass+HSS Handle Diameter: 1/4inch(6.35mm) Handle Type: Hexagonal Handle Color: Silver Tone Hole Diameter 5/64 (Hole diameter is about 2mm, use about 2.2~2.8mm sheet metal screw) 7/64 (Hole diameter is about 2.8mm, use about 3~3.5mm sheet metal screw) 9/64 (Hole diameter is about 3.5mm, use