High Quality: The 16pcs self-centering drill bit set is made of high-speed steel and a quenching treatment shell. High hardness, strong and , rust-proof, excellent drilling performance. Product Includes: 8 different self-centering hinge drill bit sizes: 5/64 inch , 7/64 inch , 9/64 inch , 9/64 inch , 11/64 inch , 13/64 inch , 5mm, 1/4 inch , with a hex key and 8 replacement drill bits, adjustable drilling depth to meet all your demand. Excellent Design: The self-centering drill bit set has an automatic centering function to improve positioning accuracy and efficiency. Double-hole design, fast and automatically discharges sawdust from the holes on both sides, without drill-blocked. Wide Application: bit is applied for furniture, kitchens, window doors, etc. Choose the appropriate size drill bit according to the hardness of the wood, you just use the hex keys take the screw apart, and replace the appropriate drill bit. Material: Steel colour: Silver Package Contents: 16 x Self Centering Drill Bit Set Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.