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Liftmaster Sears Craftsman Garage Door Opener Part Gear & Worm 1/3 - 1/2HP This Gear and worm are Compatible With All Chamberlain, Sears , Liftmaster , Craftsman and Raynor Residential Garage Door Openers Produced After 1984. * Drive Gear Bore Size: 1/2" worm , grease . * Drive Gear Outside Diameter: 2 3/4" * Drive Gear Number of Teeth: 32 Compatible with LiftMaster, Chamberlain CHAIN DRIVE garage door opener models: 41A5021 1040, 1045, 1046, 1050, 1055, 1056, 1060, 100WD, 200WD, 300WD, 110WD, 210WD, 310WD, 1260LK, 1245LK, 215WD, 220ED, 315WD, 320WD, 1240R, 1245R, 1246R, 1255R, 1256R, 985, 2565, 2575, 2595, 140, 150, 240, 350, 450, 550, 700WHC, 701WHC, 1000, 2000, 4000, 4001, 5000, 710WHC, 711WHC, 1100, 2100, 4100, 5100, 7200, 1200, 2200, 4200, 6200, 7220, CG40, 7420, PD752, PD758S. Compatible with these LiftMaster, Chamberlain BELT DRIVE models: 1280, 1280R, 2580, 2585, 8100, 8100M, 8200, 9200, WD922K, WD912KS, WD822KS