The Mtx grinding stone set consists of 5 pieces of different shapes. Each tool has a special abrasive coating made of aluminum oxide, silicon carbide for greater durability and lifespan. 

The stones are suitable for use with a drill and can be used for drilling holes of different shapes as well as engraving or grinding.

The shapes of the tools are 1 cylindrical rasp, 3 different-sized conical rasps, 1 spherical. They have a 1/4" shaft for mounting on the drill.