High Quality - Each Package Includes 20 Pieces sawtooth picture hangers, 20 Pieces no trace picture hooks and 44 Pieces 8 mm screws, They are made of high-quality plastic and stainless steel, smooth surface, rust-proof, sturdy and long lasting use.,Easy To Used - No drilling ! Just place the side of the picture hook tip on the concrete wall and gently hammer the four steel nails into the wall one by one at a constant speed until the nail ends are flush with the top of the white plastic wall hook.Fix the hanger on the back of the frame with screws, and then hang it on the hook on the wall.,Wide Function - The hooks suitable for wooden wall, plaster wall, drywall, whitewashed wall, brick wall,wallpaper walls, etc.The Sawtooth Picture hangers suitable for hanging art decorations of home, classroom and workplace such as clock, blackboard, photo frame, photo wall, small mirror.,Removable - When removing, just use a flat screwdriver or pliers to gently lift it from the wall. It only has 4 tiny pin hole like the push pin. This also means that tiny pin holes is easy to patch up, Just paint and cover.