Hangs Pictures, Mirrors & Heavier Wall Decor Easily, Safely & Securely With No Damage To Walls;Interlocking Aircraft-grade Aluminum Brackets Provide Tremendous Strength & Are Simple To Use;1 Bracket Installs On Frame Back With Included Screws & Foam-backed, Non-marring Bracket Installs On Wall Using Level & Nails;The aircraft grade aluminum brackets will not corrode and can be used indoors or outdoors;Offset 1/4 (7 mm.);12 size holds up to 120 lbs;The brackets are installed using fine nails and includes a foam backing to minimize wall damage