Plated steel 1-3/8" ID 2 piece split coupling. Clamps into recessed groove of 1-1/2" diameter shaft to retain hydraulic motor and woodruff key.Used in conjunction with the following part numbers; 329, 834, 835, 1053, 2299, 3201, 3637, 3687. Used on: Freestanding and Combo Two x Two Freestanding and Combo XL 2001 Freestanding and Combo Wrap Around Flex Around Total Side Coverage Programmable Side Washer Gyro Wrap Van Wheel. Coller comes complete with 2 bolts.