Compatible with chain drive units from Sears, Master Mechanic, and other major brands. Fits models 2245, 2255, 2265, PD210, PD212, PD610, PD612K, 1200 Series, 1240, 1245, 1246, 1250, 1255, 1256, 1260, 1265, and more. Not all models listed.Replacement gear and sprocket assembly compatible with chain drive Sears, Master Mechanic, and garage door openers from 1984 to current.Compatible with garage door opener models: 1040, 1045, 1050, 1055, 1060, 100WD, 200WD, 300WD, 1140, 1145, 1150, 1155, 1160, 110WD, 210WD, 310WD, 1240, 1245, 1250, 1255, 1260, 1260LK, 1245LK, 215WD, 220ED, 315WD, 320WD, 1240R, 1245R, 1255R, 1265, 985, 2265, 2565, 2245, 2255, 140, 150, 240, 350, 450, 550, 700WHC, 1000, 2000, 4000, 5000, 710WHC, 1100, 2100, 4100, 5100, 7200, 1200, 2200, 4200, 6200, 7220, CG40, PD210, PD610, PD612K, 7420.Partial list of 139.xxx models compatible with this kit: 139.18847, 139.18857, 139.53225SRT, 139.53225SRT1, 139.53325SRT, 139.53325SRT1, 139.53335SRT3, 139.53425SRT, 139.53425SRT1, 139.53525SRT, 139.53535SRT1, 139.53627SRT, 139.53628SRT, 139.53628SRT1, 139.53629SRT, 139.53629SRT1, 139.53635SRT, 139.53635SRT1, 139.53636SRT, 139.53637SRT, 139.53637SRT1, 139.53640SRT, 139.53641SRT, 139.53644SRT, 139.53645SRT3, 139.53646SRT2, 139.53647SRT1, 139.5364812, 139.53648D, 139.53648SRT2, 139.53650SRT, 139.53660SRT1, 139.53661SRT1, 139.53661SRT3, 139.53662SRT, 139.53662SRT1, 139.53662SRT2, 139.53670SRT, 139.53670SRT1, 139.53671SRT, 139.53671SRT1, 139.53671SRT2, 139.53671SRT3, 139.53672SRT1, 139.53672SRT2, 139.53672SRT3, 139.53673SRT, 139.53673SRT1, 139.53673SRT2, 139.53673SRT3, 139.53674SRT1, 139.53674SRT2, 139.53675SRT, 139.53675SRT1, 139.53675SRT2, 139.53677SRT, 139.53677SRT1, 139.53677SRT2, 139.53677SRT3, 139.53824SRT.Color: Photo Color Material: Plastic Package Contents: 1 x Gear and Sprocket Kit Only the above package content is included; other products are not part of this offering. Note: Lighting and display settings may cause slight color variations between the image and the actual item. Measurement tolerance is +/- 1-3 cm.