- Interlocking system with one clip fitting snugly into another to provide secure fastening and make you safe from falling objects. - Practical design with countersunk and symmetrical screw holes to allow for quick installation with minimal effort. - galvanized iron material with maximum corrosion resistance to ensure extended use for years to come. - Bring elegance to your home and office with securely mounted art works, exhibition paintings, posters and more. Material: Iron Finish: Zinc plated Color: Bronze Tone Total Size: 50mm x 43mm / 1.97" x 1.69" (L*W*H) Thickness: 1mm / 0.04" Mounting Hole Diameter: 5mm / 0.2 Package Content: 20 x Picture Frame Hooks