Roxon 28820 synthetic resin bonded aluminum-oxide cut-off wheels are intended for cutting metal, non-ferrous metal, alloys and stainless steel. Cut-off wheels can also be used on wood, plastics and some softer stones. Please note, the cut-off wheels are designed for cutting on their outside edge only; do not use the face of the wheel for grinding. The mandrel shank is 3/32 Inch and the wheel diameter is 1-1/2 Inch by 1/32 inch.