BLADE HOLDER HUB FOR HUSQVARNA LAWN MOWERS : J55 , M53-624 , M56 , M6556 , P53-625 , P56-675 , P553 , P6556 , PRE6556 MCCULLOCH : M56 , M6556 MODEL - TECHNICAL CHARACTERISTICS SHAFT DIAMETER 25. 4 mm HEIGHT 70 mm INSERTION DEPTH 66 mm PULLEY DIAMETER 50 mm CODE: 13286644 ORIGINAL CODE 532 42 11-76 , 532 18 91-79 , 532 40 46-33 , 189179 SR