Made of good quality iron and zinc plated finished, anti-corrosion and durable to use. 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: 4.5mm / 0.18"Trapezoid Size: 4mm x 7mm x 8.5mm / 0.16" x 0.28" x 0.33" (Min.Width*Max.Width*H)Screw Size (+/-1mm): 3mm x 12mm / 0.12" x 0.47" (Threaded.D*L)Total Size: 48mm x 15mm x 4.5mm / 1.89" x 0.59" x 0.18" (L*W*H) Package Content: 10 x Keyhole hangers20 x Screws