Blade for Mountfield 53 cm-53.3 cm blade m4331. Item Description: Length: 533.4 mm Center hole: 15.1 mm Rotation: Clockwise Suitable for the following models: 53.3 cm Emperor SP & SPES 83310-83311 53.3 cm Monarch 84325, 84325, 84 322, 80 4321 BTS 53cm SP BTS 5555V BTS HP S/N PF555BT182Z BTS SP S/N PF555BT181Z Emperor 21" 83301-83303, 83304 from s/n001000-83305 from s/n001000000 0, 833 06-83307, 83308-83309, 83312-86401 Emperor 21" OPC SP MP90101 Laser HP MP90501 Laser SP MP90601 Monarch 21" 84309, 84323, 843244 , 8430 1 from S/N4001-84303 from S/N7001-84304, 84301-84303, 84306-84307, 8 4310-84311 Monarch 53.3 cm 3 Speed 86501 Monarch 53.3 cm Handle Update 8 cm 4322 Monarch 53 PD MPR10123-01, MPR10144-01 Tuffcut 53cm 10062 Tuffcut 550 PD 53cm 10037