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 youand39 ll always have the right sized bit for any job. With perfectly aligned positioning, youand39 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: BrassandHSSHandle diameter: 1 or 4inch(6.35mm)Handle type: hexangular handlecolor: silver toneHole diameter5 or 64 (Hole diameter is about 2 mm, Use about 2.2-2.8 mm tapping screw)7 or 64 (Hole diameter is about 2.8 mm, Use about 3-3.5 mm tapping screw)9 or 64 (Hole diameter is about 3.5mm, Use about 4-4.5 mm tapping screw)11 or 64(Hole diameter is about 4.5mm, Use about 5-5.5 mm tapping screw)13 or 64(Hole diameter is about 5.1mm, Use about 5.6-6.1 mm tapping screw)1 or 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 or 64 7 or 64 9 or 64 11 or 64 5mm 13 or 64 1 or 4includes:1 set(7pcs) x Self-Centering Drill Bits