[Quick release] The 1/4 quick release screws are treated with black nickel, and the sturdy design provides a reliable connection point, and at the same time completes the quick and easy installation and release system. [Safety and stability] The safety question mark hook is made of high-strength steel and coated with black nickel metal. This hook is stronger, rotates more smoothly, and has a lock to ensure the safety of the camera. [Easy to use] You can quickly attach or remove the camera strap without wasting time messing up the strap and its parts. [Included in the package] 2 1/4-inch digital camera accessory shoulder strap screws; 2 black quick security question mark hook safety locks, and SLR camera snapshot shoulder strap hooks. [Quality Assurance] 100% quality assurance, high quality is our only belief. I believe you will receive our products and you will be satisfied. Color name: 2 sets (4 pieces) This is an international standard precision manufacturing 1/4 quick release screw Material: aluminum alloy and stainless steel (metal) Packing: 1, 2 1/4 inch digital camera accessory shoulder strap screws; 2, 2 black quick safety question mark hook safetylock , SLR camera snap shoulder strap hook.