Made of strong, galvanized steel, sturdy, wear-resistant and rust-proof, enough to support any size shelf Overall length: 76mm/3"; Rectangle base size: 70 x 14.5 x 4mm (L*W*T), Mounting hole size: 12 x 6mm (L*W) Hidden inside the shelf, stable support, you can DIY the backdrop wall shelf in the living room, bedroom, office, store, hallway, etc.Easy to install, easily install these floating shelves. Just drill a hole in the shelf to fit the diameter of the rod and screw it into the wall Note: Only 6 invisible shelf brackets included, but shelf and screws are not included!< /p>Note: The data are all manual measurement, please allow 1 - 13cm error, due to the difference in light and display, there will be a certain color difference, depending on the physical object received.