Designed multi-purpose for drilling the mounting holes in masonry, marble, limestone, and concrete (countertops only). Great for faucet mounting holes in stone and concrete countertops.
Can be used dry when water is not an option, but to prolong its using life, must be used with water for cooling and lubrication.
All bits are suitable for 5/8"-11 thread angle grinder;Recommended RPM is 6000; Maximum RPM is 11000.
If you fit them on electric drill or other machine, you need an adapter such as Hex Shank or SDS Plus Shank.