[Hidden mounting brackets]- Can be used for DIY or custom ledges, completely hidden in walls and boards, simple and fashionable, to make your home more beautiful and tidy. [Material]- The inside of the floating shelf bracket is made of iron, its housing and expansion tube are made of plastic. It's fine workmanship, sturdy and durable. [Dimensions]- The total length is 175mm, the length of the expansion tube is 75mm, the diameter is 12mm, and the length of the support rod is 100mm, the diameter is 10 mm. [High Stability]- The support rod is a hexagonal cylinder with barbs, which increases the obstruction of the board and improves stability. [Strong load-bearing]- The load-bearing capacity of the wall shelf bracket is very strong. If properly installed on a suitable fixed brick wall, the bracket can support approximately 20 kg. Product Description [Name]: Wall Mounted Hiding Nail Brackets for Floating Shelves [Material]: Metal (Iron) + Plastic [Color]: Brown [Size]: 10mm x 100mm [Size]: Total length: 175mm Expansion tube length: 75mm, diameter: 12mm Support rod length: 100mm, diameter: 10mm [Package]: 6 x Hidden Floating Shelf Brackets The Board Bracket can support and fix all kinds of wall shelves, such as bookcases, display stands, garage shelves, decorative shelves, bathroom shelves, shoe shelves, etc. It can definitely satisfy your various designs of DIY wall brackets. Installation steps: 1. Begin by measuring the hole spacing and drilling the hole in the wall. The depth of the hole should not exceed 75 mm. 2.Insert the expansion end of the bracket support pin into the hole in the wall, with the black screw cap on the end. 3. Insert the support rod into the wall hole expansion plug. Once the end of the screw is properly contacted with the screw cap and tightened clockwise, continue to turn until the expansion plug in the wall expands to fully support the wall. 4. Then drill the hole of the corresponding size on the side of the board (according to the hole spacing of the wall). 5. Finally, insert the board into the board support rods. Note: 1. You need to prepare a 12mm drill bit for drilling holes in the wall and another 10mm drill bit for drilling holes in the wood. 2. Remember to place the central silver metal ring on one side of the expansion tube and embed it in the wall. 3. Each painting must have at least 2 invisible supports and be maintained in the same horizontal position.