Different sizes of diamond drill bits: 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 26mm, 28mm, 30mm, 40mm, 50mm. They meet many requirements, so you can drill according to your needs.Advantage: Coated with high-quality diamond, the diamond hole saw provides a high-precision, smooth cut without broken edges.Applicable area: diamond drill bits for glass, ceramic bottles, glass blocks, ceramics, marble slabs, perforated granite and other hard surfaces (especially glass and ceramics).Note: Use lubricant (water) when using these drill bits, otherwise the diamond core drill will burn. Not for use on concrete or deeper than 1/2 inch. Product Description Color: Silver Hole Saw Diameter: 6mm, 8mm, 10mm, 12mm, 14mm, 16mm, 18mm, 20mm, 22mm, 25mm, 26mm, 28mm, 30mm, 40mm, 50mm Suitable Industry: Suitable for stone, tile, ceramic, glass and granite, etc. Product Feature: Durable drill bits provide good performance. hard. Ideal for glass and tiles to clean precise holes. When using it, you should pay attention to the following points: Do not use for concrete or for depths greater than 1.27 cm. Start your hole diagonally, make a round groove and keep the drill straight. Always use water for lubrication, otherwise the diamond drill will burn. Reduce the drilling speed, reduce the drilling pressure and greatly increase the water lubrication to extend the life of the drill bits. Sold by HANBING store