The LiftMaster sprocket 18T 1" Bore 1/4" Keyway 50B18T 71-1550B18LGH is a durable and high-quality gear designed specifically for LiftMaster garage door openers. Made of metal and manufactured in China, this sprocket is compatible with LiftMaster models and comes as a single piece in the package. With a 1" bore size and 1/4" keyway, this sprocket is essential for maintaining the proper functioning of your garage door opener system.