Protect cable during pull-out. Machined of steel for durability and zinc plated to protect against corrosion, the 5/8" diameter swivel features an internal tension bolt engineered to break when pulling tension exceeds 600 lbs.(+/-5%). Replacement Bolts/ BS-63/600. Bolts are quickly replaced with an adjustable crescent wrench and allen wrench. Wt. 4 oz.