High Quality:- Made of durable metal with copper/zinc/nickel, rustproof, anti rotation, durable and long service life. Reusable and easy to install:- Simply to set the picture hooks on the wall with nails, the invisible appearance makes it easy to remove and reuse. When removed, there are no marks on the walls or frames except for a small dot. Product: 100 x D-hooks + 100 x screws Product size: D-hooks 13.7*21.6mm Screws 8.3*5.3mm Box 128*65 *22mm Great Organization:- Paintings hang includes small screws (not general nails), not only keep all hooks neatly organized, photos also portable and reusable. Wide Usage:- Suitable for hanging heavy mirrors, pictures, pictures, paintings, canvases, publications, wall clocks, etc.