Our diamond stone dry drill bit fit on a high-speed angle grinder. It provides the best cutting performance and can drill through the toughest 1-3/8" granite or engineered stone countertop at the job site without using water. Not only is this convenient but it also increases productivity by cutting down on the amount of clean up needed when using water.
Size:
-Φ35(1-3/8'')/ 5/8mm''-11/  L60mm
 
Designed for drilling cured concrete, reinforced concrete, concrete brick and block. Dry drilling by handheld core drill or stand core drill
Specifications

stone dry core bit
1.Side protection
2.Speed:2500-5000rpm
3.20-30s/hole for 3cm granite
4.Lifetime:80-100 holes