Dynabrade® Contact Arm Assembly, For Use with: Mini-Dynafile® II 15003 Abrasive Belt Tool, 1/4 in, 1/2 x 12 in Belt, 1 in dia x 3/8 in W x 3/8 in ID Wheel and Round Radius Wheel Face, 70 Duro Rubber Wheel. Dynabrade® 15028 Contact Arm Assembly, Use with Mini-Dynafile® II 15003 Abrasive Belt Tool, 1/4 in, 1/2 x 12 in Belt