Uses: you can freely combine the wall hooks without damage to hang different items for decoration, suitable for hanging photos, watches, paintings, small mirrors, art, keys, clothes, umbrellas, bags Material : removable hard wall hanger made of ABS and steel nails, 4 steel nails were gently driven into the wall with a small hammer in selected places, causing minimal damage to the wall and leaving only 4 shallow holes in the wall with the concrete hook removed. [Scope of application]: Picture hanging accessories can be used on all kinds of surfaces, more suitable for dry walls, concrete walls, cinder block walls, wall cement wall, plaster wall, lime wall, white wall, wooden door, etc. Not suitable for glass, tiles, steel plate. Wall hanging kit - best solution for art painting/wall clock/wedding photo