Blade HUB Compatible with HUSQVARNA lawn mowers FOR MODELS: 5521 CHV, 7021CH1A, JET 55S, R52E, R52EE, R52S, R52SE CHARACTERISTICS: Shaft diameter: 25.4 mm Insertion depth: 22.2 mm Reference code: 22-280 Original part number: 532 18 45-90, 532 19 37-07, 532 41 83-73, 532 42 00-97 HUSQVARNA