Product Name: Vacuum Brazed Diamond Dry Drilling Core Bits Quantity: 2 Pieces 08mm (5/16 Inch) Specification: Diameter: 8mm, Max working depth: 35mm, Diamond height: 10mm, Total Length: 62mm 6mm-16mm bits with Wax inside helps cooling the bits **The Thread of bit is 5/8-Inch-11, Recommended Machine: angle grinder** If you fit them on drill or other machine, you need an adapter, such as SDS, hex, Round plus shank... Application : Dry/wet drilling for porcelain tile, granite, marble, stone, Masonry, brick... Feature: 1. Minimizing any breakage and safe for operator 2. High quality Diamond Grain provide fast and smooth drilling 3. Vacuum Brazed technology provide much longer working life than electroplated technology =========THE END========== Available Diameter: 6mm-152mm(1/6 Inch to 6 Inch). Operation Tips for Vacuum Brazed Diamond Drill core bits 1.Do not use these drill bits with hammer mode 2.Only fit these drill bits on a cord drill, not cordless drill(no enough power) 3.Only for tile drilling not recommend for the material behind the tile 4.For horizontal drilling,just give a gentle pressure For vertical drilling, the weight of the machine will give sufficient pressure 5.Start drilling as per following instructions: 1) Place the drill at a 45 degree angle 2) Drilling till the hole start to form 3) Bring the drill up into upright position 4) Continue to drill and swaying the machine along a circle ABOUT SHDIATOOL: We are a professional Manufacturer & Supplier of diamond tools in China, If you have any needs or questions about our products,please contact us firstly, thanks, we have good After-sales service, better quality and professional suggestions.