Material: Using high quality diamond, the ability to drilling was better that the drilling hole is more precise. 16 PCS drill bits: Comes with 16 PCS different sizes of drill bits, including 6mm 8mm 10mm 12mm 14mm 16mm 18mm 20mm 22mm 25mm 28mm 30mm 35mm 40mm 45mm 50mm Wide usage: Widely used in glass, ceramic, marble and other hard brittle materials. Durable: Drill bits are made from diamond coating, which is excellent for making precise and smooth holes in glass or other fragile hard materials. Attention:Due to different monitors and light effects, the actual color of the item may be slightly different from the pictures shown in the picture. Thank you Note: The data are all manual measurements, please allow 1 - 3cm error, due to the difference in light and display, there will be a certain difference color, depending on the physical object received. Our service: We are committed to providing you with satisfactory service. If you have any questions, you can contact us at any time. We will reply to you within 24 hours and try our best to solve the problem for you. Contents: 1 set of 16 diamond drill bits.