Dynabrade® Contact Arm Assembly measuring 5/8" X 3/8" includes a rubber wheel and a 1/2" wide platen pad that are suitable to use with 1/2" X 18" L belts and finds application in belt tracking, grinding, sanding works. Arm assembly is compatible with models 40335 and 40500. Arm assembly is used on metal, plastic, fiberglass, composites, rubber, glass, stone. It features an unique offset design that helps to ensure easy strap polishing with its arm. It is industrial-rated for tough production performance.