These Wheels are made from premium quality coarse/medium aluminium oxide/silicon carbide abrasives and with best bonding materials. Normally used in portable angle grinder.
They are kind of powered wheels used in grinder machines in workshops. Abrasive Wheel is made of small abrasive particles like that of grit
The manufactured abrasives most commonly used in grinding wheels are aluminum oxide, silicon carbide, cubic boron nitride, and diamond.