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 coated 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 fabric reinforces the wheel, providing 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 22.23 mm bore diameter for standard angle grinders with a clamping nut.