41A2817 Liftmaster Replacement Drive Gear w/pins-Replacement gear kit assembly for all 1984-Present garage door operators.-Compatible with Liftmaster, Chamberlain, Sears Craftsman-Compatible with some Master Mechanic,and Wayne Dalton [Please email us if you have one of these units to confirm compatibility]-Includes: Gear, Plastic Worm Wheel, Lubricant Grease and all necessary washers and hardware.-OEM>Original Equipment Manufacturer Replacement Part.