Material : Cold rolled steel Thickness :10mm Finish : Brown Installation Method : Drill into the wall Package Includes: 4 x Brackets 【Premium Material】The wall brackets constructed from high quality Solid cold rolled steel, ensuring quality and longevity. 【Hidden Design】Hidden installation design, this floating shelf brackets bring modern and beautiful, simple and stylish look, make the floating shelves appear more elegant on the wall and add more artistic touch to the walls at the same time. 【Detailed Dimensions】Size: 220 x 10''/8.67" x 0.4" (L*W); Mount Hole Dia.: 12mm/ 0.48"; Bar Dia.:10mm/0.4'', the l bracket's size is suitable for float shelves of various specifications and can provide sufficient load-bearing capacity. 【Heavy Duty】The l brackets made of solid and thick metal construction, robust and heavy to carry weight, ensure the heavy duty brackets can carry at least 50 pounds of weight per pair. 【Notice】-IMPORTANT: When installing, be sure to ensure that the size of the borehole is correct. 2. After tightly inserting the expansion anchor into the installation holes, then tighten it to make the expansion anchor explode to achieve a fastening effect. Only in this way can a firm installation be ensured. 3. Many customers may have drilled holes too large, causing the expansion anchor to become loose when inserted into hole, which makes it difficult for the expansion anchor to crack.