Dynabrade 11218 Contact Arm Assembly, 5/8-Inch Diameter by 3/8-Inch W, Rubber Wheel with 1/2-Inch W Platen; For 1/2-Inch W by 24-Inch L Belts Standard arm on Dynafile Model 14000 Superior belt tracking For use on metal, plastic, fiberglass, composites, rubber, glass and stone Industrial-rated for tough production performance