1/0 x 15 Solid Brass Safety Plumbers Chain with Safe Work Load (SWL) of 30 lbs. KingChain Safety Chain, also known as Plumbers Chain, is specifcally designed for use with bath and plumbing applications. It is a stamped, flat-link pattern chain that is particularly well-suited for travelling over pulleys. Safety Chain is made from solid brass and is not heat-treated. Do not use for overhead lifting. Never exceed the Safe Working Load (SWL).