Cable Drum Set Includes 3/8 in Set Screws For Use With Mfr Model Number 1 in Shaft Commercial Standard Lift Garage Doors Lifting Weight per Drum 500 lb Maximum Door Height 144 in with Highlift 32 ft 1 in Maximum Highlift 120 in Type Specialty Coated Die Cast Aluminum For Use With Commercial Standard Lift Garage Doors 1 in Shaft Maximum Door Height 144 in with Highlift 32 ft 1 in Maximum Highlift 120 in Lifting Weight per Drum 500 lb 1 Pair