Heavy Duty Shelf Bracket: The 20cm black shelf brackets are made of heavy duty iron which is durable and sturdy. Solid thick metal, smooth edges, water and rust proof, modern look and no worry about daily scratches, corrosion and tarnishing. 90-degree bent, hidden Solder joint. Triangular Design: Triangle shape is the sturdiest construction in wall brackets currently. Wall shelf brackets are designed by triangular structure, provide good stability. Maximum load is 30kg / 66lb per pair. Triangle shape structure of stable right angle, easy to make level and get rid of wobbles. Easy to Install: Equipped with mounting accessories, include stainless steel screws and anchors. There are 5 holes on the of the bracket for install the screws easily. You can easily wall mount floating shelves up with ease. Come with all hardware you need. Just need a drill to make a hole and then you can mount your shelf brackets easily. Space Saver: This triangle shelf bracket can be easily modified to place exactly where you want. And our shelving supports are the perfect added-storage solution for home where space is limited. Heavy duty shelf bracket: 200 x 120mm; Long screws size: 30mm; Short screws size: 16mm; Please confirm the size before purchase. Better Living Environment: Hidden shelf support brackets is good idea for wooden shelves, Bookshelf, Kitchen shelf, Exhibition Stand, Outdoor Garden Shelf, External Wall Hanging Brackets etc. It can make your home clean and tidy after you place a piece on this Brackets. Meanwhile, it can bring artistic feeling to your house.