Compatible with Chamberlain Sears Craftsman operators from 1984 to present with chain drive. Kit Includes: Gear and Pinion, Worm Gear, Grease, Motor Shaft Bearing, Pinion Bearing Compatible with Chamberlain, Sears, Craftsman and Lift Master 1/3 and 1/2 HP Chain Drive Models AssemblySimple and Complete DIY Replacement for Liftmaster 41c4220a Gear and Pinion Set Works with Chamberlain Sears Craftsman Chain Drive Models Einfache selbstmontage - complete assembly. Set includes: gearbox and pinion, worm gearbox, grease, motor shaft bearings, pinion bearings Compatible with Chamberlain, Sears, Craftsmans and Hubmaster 1/3 and 1/2 HP chain drives Note: Due to the light and screen setting difference, the item's color may be slightly different from the pictures. Please allow slight dimension difference due to different manual measurement. Sold by-Dadangjia