ITEM NAME:Worm Gear for MTD 917-04861 20T 717-04449 717-04861 717-0528 717-0528A 917- X7A8 Worm Gear for MTD 917-04861 20T 717-04449 717-04861 717-0528 717-0528A 917- X7A8 This is a replacement part manufactured for use with snow throwers. This special worm gear drives the auger shaft and has a key slot in the arbor to fit onto the output shaft using a woodruff key. Part Number: 717-0528A, 717-0528, 917-0528A, 717-04449, 717-04861, 917-0528, 917-04861 Fitment: Fits Various Bolens, Columbia, Craftsman, Gold Series, Huskee, MTD, MTD Gold, MTD Pro Private Label, Ranch King, Ryobi, Troy-Bilt, Yard Machines and Yard-Man models For MTD 917-04861 20T Worm Gear Fits Bolens Craftsman Troy-Bilt Cub Cadet Colour:Gold Material:metal size:OD:1 7/8 inch ID:3/4 inch Teeth:5/8 inch W- 20 Package Contents: 1 x Worm Gear.For MTD 917-04861 20T Worm Gear Fits Bolens Craftsman Troy-Bilt Cub Cadet. This special worm gear drives the auger shaft and has a key slot in the arbor to fit onto the output shaft using a woodruff key.