1. Part Number: Replacing part numbers are 717‑0528A, 717‑0528, 917‑0528A, 717‑04449, 717‑04861, 917‑0528, 917‑04861, 917‑05861.2. Applicable Model: Replacement for Cub Cadet; Replacement for MTD machines; Replacement for Troy‑Bilt Sears 40‑42in snowblowers.3. Dimensions: The outer diameter is approximately 1 7/8 in, the inner diameter is 3/4 in, width 5/8 in, keyway 3/16 in, 20 Teeth.4. Powerful Function: 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.5. Good Replacement: This is a replacement part manufactured for use with snow throwers. Direct replacement for the old or damaged worm gear.Spec:Item Type: Worm GearMaterial: MetalPart Number: 717-0528A, 717-0528, 917-0528A, 717-04449, 717-04861, 917-0528, 917-04861, 917-05861OD: Approx. 1 7/8 inID: Approx. 3/4 inWidth: Approx. 5/8 inKeyway: Approx. 3/16 in, 20 TeethFitment:Replacement for Cub CadetReplacement for MTDReplacement for Troy-Bilt Sears 40-42in SnowblowersPackage List:1 xWorm GearNote:1. Please double check the part number of your item, matching information is for reference only.2. If you are unsure of the item, please contact us before buying to avoid unnecessary return, thanks!