Made from white corundum & brown fused alumina. _x000D__x000D_
Wheel size: 4in x ¼in x 5/8 in. _x000D__x000D_
Grinding Metal; stainless steel; general steel; cast iron. _x000D__x000D_
Depress type high hardness; long life. _x000D__x000D_
Grinding wheels are designed with a depressed center flange for use in hand angle grinders. _x000D__x000D_
Formulated to be used for grinding. _x000D__x000D_
Grinding wheels perform best when used at a 15-30 degree angle to flat surfaces.