50mm Swivel Casters with Brake, 400kg Capacity, Rubber Wheels for Heavy Furniture, Black Trolley, Non-Marking

Transmission compatible only as a repair kit: 41A2817 & 41C42200A 81B0045

It is compatible with 1/3 HP, 1/2 HP, and 3/4 HP garage door openers with chain and belt drive manufactured in 1984.

Works with: Liftmaster, Chamberlin, Craftsman, Sears, Master Mechanic, and Wayne Dalton.

This is only the replacement sprocket. You must provide sprocket grease. [Important: If you do not grease, the sprocket will be removed.]