These brackets are heavy-duty 100% one-time forging, strong and durable, enough to support a person’s weight. Made of thick iron with black powder-coated, Corner bracket heavy-duty design thick metal, bright black not easily dirty. Sturdy and durable. Screw holes are countersunk, the head of the screw is not protruding after the screw has been screwed in, simple and aesthetic appearance. These angle brackets can be used to mount furniture, small bookshelf, build a frame, cabinets, wooden table, device or support/fix the wooden board on the wall, etc.