Package Contents: 50pcs D-rings and 50pcs screws Material: Galvanized surface metal material, sturdy and durable, corrosion resistant, high strength and long service life. They can be used to hang photos, paintings, clocks, decorations, lights, kitchen utensils or even clothes. Reduce damage to walls: After removing the professional hanging kit, only small nail holes remain and can be easily covered with paint. Tiny invisible nails can be reused. All you have to do is place the hook on the wall and use a hammer to drive the nail into the wall. The rounded top of the hooks protects your fingers from injury. You can use a drill to make a hole first if you have difficulty driving the nail into the wall.Specification Material: Metal - Color: Black Hook size: 10 x 21 mm; screw size: 3 x 10mm Bearing capacity: 3kg package includes 50 * photo hanger; 50 * black screws How to install Put the screws into the grooves of the photo holder. Just use Phillips screws on the back of the wood. The screws are small, but easy to install. (Please pay attention to safety when installing to avoid hand injuries) Widely used This picture frame mounting kit is ideal for artwork, photos, clocks, mirrors, picture boards displays, paintings, nail-free hanging pictures, canvas supports and more for your home, office or exhibition. Notice For small screws, please keep away from children and avoid swallowing.