Features and Benefits:Dynabrade? Contact Arm Assembly measuring 3/4" X 5/8" includes a rubber wheel and a 3/4" wide platen pad that are suitable to use with 5/8" X 18" L belts. Arm assembly finds application in grinding, sanding works and is compatible with dynafile? II and electric dynafile? II. It can be use on metal, plastic, fiberglass, composites, rubber, glass, stone. It has belt tracking and patented design that can be used on coated abrasive, abrasive impregnated non-woven nylon and cloth polishing belts. It features an unique offset design that helps to ensure easy strap polishing with its arm.IncludesContact wheel assembly, platen pad