This Grinding Tool Set is used in a wide variety of metals and non-metallic grinding carving processing, installed in the mill, such as electric power tools. 5pc Mounted Stone Set.a Very Handy Set Which is Ideal For Polishing, Grinding, carving & Cleaning Includes All Popular Shapes Such As tree, Cone, Ball, Cylinder & Wheel 5 Pieces With 1/4″ Shanks Fits All Standard Cordless, Power Drills & Air Die Grinders