We could offer customized service, any further questions please contact us. BRSCHNITT Welded Diamond Drilling Bits for Marble Granite.... Package Contens: 1pc Grit: #25/35 Connection: 5/8"-11 Thread MAX RPM:11000; Recommended RPM: 6000 Specification: *Diameter: 35mm, Diamond height 10mm, Workable length 77mm, Total length 100mm Application: 1. Used for drilling granite, marble, stone, concrete and other materials; 2. Dry or wet use, suitable for angle grinder. Functions&Feature: 1. High-quality Diamond Grains, fast and Smooth drilling,provides a better finish; 2. 10mm Diamond height design, improves greatly work efficiency, less debris; 3. laser welded technology, you could drill smoothly with no broken edges. Note: Don't use impact or hammer mode.