ITEM NAME:4pcs D-shape 30KN Heavy Duty Carbon Steel Screw Locking Climbing Carabiner Description: 30KN/ 6600lbs, high strength Screw locking, safety protection D-Shape, heavy duty CE certified, premium quality Application: rock climbing, hiking, exploring, rappelling, , engineering protection, aerial work Specification: Color: Black Materials: Carbon Steel Size: approx. 100 x 55mm/ 3.9 x 2.17 inches (L x W) Gate Opening: 16mm/ 0.63 inch Package Includes: 4 Pieces D Shape Climbing Carabiner.30KN/ 6600lbs, high strength. 4 Pieces D Shape Climbing Carabiner. Application: rock climbing, hiking, exploring, rappelling,, engineering protection, aerial work. Screw locking, safety protection. Materials: Carbon Steel.