Suncor Stainless Manufactures The 360 Degree Anchor Swivel. Our Stainless Steel Chain And Anchor Swivel Shackle Is Precision Cast And Made From Grade 17-4 Ph Stainless Steel For Maximum Corrosion Resistance And Durability. It Swivels 360 Degrees And Is Equipped With A Solid Bronze Thrust Washer And A Stainless Steel Screw Pin. Multiple Sizes Are Available To Fit 1/4" To 3/4" Chain.