Usage Tips:Features:1. Effortlessly drill precise holesThe Self-Centering Drill Bits make precise drilling quick and easySave your time and energy by effortlessly creating perfectly centered holes.2. Drill accurate, well-centered holes every time with the Self-Centering Drill BitsWork smarter and increase your productivity with precise and accurate drilling3. Create perfectly centered holes: The Self-Centering Drill Bit is built with a spring-loaded guide that centers the bit. The spring-loaded guide within the bit creates precise positioning-every time.4. 7 bits included, versatile sizing: The Self-Centering Drill Bits come in 7 different sizes, ensuring you&39;ll always have the right sized bit for any job. With perfectly aligned positioning, you&39;ll create a clean and professional product.5. Accurate, reliable and built to last: Crafted from carbon steel and aircraft-grade aluminum, the drill bits are durable, strong and built to withstand extended use. The bit are perfect for door hinge installation, cabinet installation, drawers and more.Notice: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.Specification:Material: Brass+HSSHandle diameter: 1/4inch(6.35mm)Handle type: hexangular handlecolor: silver toneHole diameter5/64 (Hole diameter is about 2 mm, Use about 2.2~2.8 mm tapping screw)7/64 (Hole diameter is about 2.8 mm, Use about 3~3.5 mm tapping screw)9/64 (Hole diameter is about 3.5mm, Use about 4~4.5 mm tapping screw)11/64(Hole diameter is about 4.5mm, Use about 5~5.5 mm tapping screw)13/64(Hole diameter is about 5.1mm, Use about 5.6~6.1 mm tapping screw)1/4 (Hole diameter is about 6.3mm, Use about 6.8~7.3 mm tapping screw)5mm (Hole diameter is about 5mm, Use about 5.5~6 mm tapping screw)7pcs include 5/64 7/64 9/64 11/64 5mm 13/64 1/4includes:1 set(7pcs) x Self-Centering Drill Bits