Description:Made of good quality iron and zinc plated finish, anti-corrosion and durable to use.Keyhole hangers can be used to hang artwork, plaques, wall decor, picture frames and mirrors, etc.Easy to install by screws. Mounting screws are included here.Specification:Material: IronFinish: zinc platedPlate Thickness: 0.7mm / 0.028"Mounting Hole Diameter: 4mm / 0.16"Keyhole Size: 13mm x 7.5mm / 0.51" x 0.295" (L*Max.D)Screw Size (+/-1mm): 3mm x 12mm / 0.12" x 0.47" (Threaded.D*L)Total Size: 37mm x 13mm x 2.5mm / 1.46" x 0.51" x 0.098" (L*W*H) Package Content: 20 x Keyhole hangers40 x Screws.