Garage Door Opener Parts - LiftMaster
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LiftMaster 71-1550B56QGH Sprocket Kit, 56 Tooth, 1.25"BX3/8"KSKU: 71-1550B56QGH$54.7156-tooth sprocket kit with 1.25" bore and 3/8"…
LiftMaster 71-1550B56LGH Sprocket Kit, 56 Tooth, 1.25"BX1/4"KSKU: 71-1550B56LGH$54.71Special OrderWhat does this mean?56-tooth sprocket kit with 1.25" bore and 1/4"…