Designed for grinding metal. We developed the PRO Metal for metalworkers who need a reliable and durable grinding wheel for metal grinding. The long-lasting PRO Metal bonded grinding wheel is equipped with high-quality aluminum oxide grains to efficiently grind metal and steel. We combined the grains with functional fillers and embedded them in a phenolic resin matrix for stability, heat resistance, and reliable grinding performance. A precision-engineered fiberglass mesh reinforces the wheel and provides additional safety. It is free of iron, so you don't have to worry about rust on your workpiece when cutting stainless steel. With a bore diameter of 22.23 mm for standard angle grinders with a clamping nut.