Easy installation: The 16-inch shelf bracket comes with 10 long screws and 10 expansion tubes, as well as 14 short screws, so you can do your own bracket. During installation, fasten screws to the support to prevent it from falling.Stable shelf bracket: Heavy duty l brackets triangle design fireplace metal bracket, triangle welded grommet size 0.8*0.8 inches, ensure the weight-bearing capacity of the bracket, you can hang items between two brackets, save space while you can also decorate the bracket.Two mounting methods: Our shelf brackets can be mounted on concrete and wood Our shelf design is compatible and can be well integrated with different decorative styles for your countertops, fireplaces, bookshelves vanity, cabinet and more.These are16" long on one side and 12" long on the other, you can mount either way. Multi-functional application: Countertop support brackets can be used for countertop support and overhang shelf brackets. The 16-inch heavy duty wall bracket features a triangular structure that can hold up to 500 pounds or more. Suitable for warehouses, kitchens, basements, garages, storage rooms, shops, offices, etc Heavy duty design: These 16 inch shelf supports are made with black powder coating, the powder coating surface can protect the wall shelf bracket surface from indoor humid air corrosion and prevent the metal bracket from rusting outdoors.