Used by museums and art galleries worldwide. The hardened, blue steel nails with brass collar are reusable and leave a pin-size hole in wall surfaces that can be easily painted over. The hook's unique hand welded center-of-gravity easily guides nail straight into the wall at the perfect angle for a secure hold. The reinforced elbow of hook adds support. Weight ratings are based on hangers nailed into studs and are not cumulative so two hangers will not hold double the weight. For best results, choose a recommended weight rating that greatly exceeds the object to be hung. Hooks come packaged in a reusable storage tin, great for toolboxes or kitchen drawers