The picture hanging hooks are made of high quality metal. Heavy duty picture hooks for hard walls is durable and sturdy. Holes design provides better stability, just use screws to screw into the photo frame, easy to install, The screws are so small that they won't damage the wall when screws to the wall. Hook for hanging picture are usually used in home,office,school and restaurants etc. Picture frame hooks is suitable for bedrooms, living rooms and corridors. The photo frame hanger kit is packed in a transparent plastic box. Easy to store and carry, not easy to lose. Colour:Silver+gold+black Material:metal Package Contents: 4 x 2 holes D-rings 4 x 3 holes D-rings 4 x 1 holes Triple-cornered rings 4 x 2 holes Triple-cornered ring 4 x 2 holes serrated hooks 4 x 2 holes hanger hooks 4 x S shape frame hanging hooks 40 x screws Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.