Mizugiwa Anchor Swivel for Chain 1/4-5/16 inch Anchor Swivel Connector 316 Stainless Steel Overall Length 3-1/2" Opening For Chain 3/8",Opening For Anchor 5/8" Pin For Chain 1/4",Pin For Anchor 5/16" anchor chain swivel connector tested working load of 1900 ~ 2200LB