made of 304 stainless steel, which is hard and durable, does not rust and is resistant to corrosion, buckles of common metal. 2PCS M8 Swivel Ring Double Ended Swivel Eye Hook; 2PCS M8 Carabiner Double Ended Swivel Eye Hook Loop Overall Size : 90 x 35mm/ 3.5" x 1.37"(L*W) Loop Dia : 7.3mm ; M8 Carabiner Spring Hook Overall Size : 80 x 40mm/ 3" x 1.58" (L*W) Loop Dia : 7.8mm. Double Ended Swivel Ring rotates 360 degrees to prevent twisting of the rope. Suitable for swings, hanging chairs, hammocks, tire swings, punch bags, sports rope fitness ropes or any entangled and twisted ropes, suitable for indoor and outdoor use. Made of 304 stainless steel for corrosion resistance and durability as well as load resistance. Heavy Duty Spring Hook Carabiner with safety clasp; double-headed rotating eye hook prevents free twisting, twisting and rotation of the rope. Producxt name: Double Ended Swivel Eye Hook Material:304 stainless steel Color: Sliver Size: M8; 90 x 35mm/ 3.5" x 1.3"(L*W) Single Loading Weight: 1000 lb Producxt name: Carabiners Spring Hook Material:304 stainless steel Color: Sliver Size: M8; 80 x 40mm/ 3" x 1.58" (L*W) Working Load Limit: 350lbs Package Included : 2PCS 304 Stainless Steel Carabiners with locking mechanism 2PCS M8 304 Stainless Steel Double Ended Swivel Eye Hook