STRENGTHEN WEIGHT CAPACITY: A triangle support is welded in each corner of shelf brackets to strengthen the weight capacity. It can hold 30kg/pair on concrete wall, and this design helps the brackets more sturdy and durable. BEVELING ENDING: The brackets ended with beveling surface, safe for daily use without scratch risk. CONTENT: 4pcs heavy duty shelf bracket (Wooden shelf is not included), 8pcs black long screw and 8pcs anchor (for wall), 8pcs black short screw (for shelves). FINISH: These triangle shelf brackets are coated with matte black painting. It can protect brackets from oxidation and also make them look elegant. They will be your space saver but also a home decoration on your wall. SAVE YOUR SPACE: The floating shelves brackets can be used as bookshelf, kitchen shelf, exhibition stand, garden shelf, external wall bracket etc.