Spindle Shaft / AYP 137553Pack Size:1AYP 137553, Husqvarna 532 13 75-53Laser 97641, NHC 260-0673, Oregon 85-023, Prime Line 7-05274, Ratio Parts 22-556, Rotary 9520, Sunbelt AY21, Sunbelt B1AY21AYP 44", 46" and 50" ventilated deck Double hex external spline for pulley, Blade mount is a 5 pt. star, Height: 4 7/8 " OVERALL, Includes bottom bearing