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. 1. 50 D-rings + 50 8*5mm screws 2. D-ring 60pcs+8*5mm screws 60pcs 3. D-ring 80pcs+8*5mm screws 80pcs 4.D-ring 100pcs+8*5mm screws 100pcs Great organization:- Paintings hang includes small screws (not of general nails), come with a plastic box, not only keep all the hooks well organized, also portable and reusable pictures. Wide Usage:- Suitable for hanging heavy mirrors, pictures, pictures , paintings, canvases, publications, wall clocks, etc.