4 sets of heavy duty lifting brackets are made of high strength steel,enough sturdy to make sure safe use for engine hoist.The capacity of single lift bracket is 5,500 lb Angled design engine lifting bracket bolt can be directly to the lift engines /transmissions/radiator/truck motor and other heavy parts in need be lifted,it\u2019s use with load levelers and lifting slings Widely use: The 7100 5,500 lb. capacity lifting brackets set kit can be used to lifting engines when maintain&repair engines(includes:automotive engines,tractor engines,mack engines), lifting transmissions,removing radiators out of trucks and lifting other heavy loads The engine lift bracket are great tools for workshops and garages,make job easier and faster,improve work efficiency Maximum load lifting capacity: 5,500 po, lifting brackets acceptable max bolt diameter: 1/2 inch.Package includes: 4 sets of lift brackets"