[Heavy Duty Steel Countertop Support Brackets]Constructed with high-quality Metal, this hidden countertop support brackets are built to withstand heavy loads. Each pair of knee wall invisible shelf can hold up to 400lb,providing reliable and affordable support for your countertops.It can safely support any type of countertop,including marble,granite,quartz,manufactured stone, and more. [Strong Industrial Value and Modern Design]Countertop support top mount bracket is perfect for concealed countertop , Safely provide strong and nonintrusive support for any types of the countertop.The specially designed 45° angle beveled edge adds an extra layer of safety, protecting users from potential accidents. [Excellent Made]Countersunk holes and back-leveled edge for safety and modern style,The surface is sprayed with black anti-rust paint, corrosion-resistant and rust-resistant.perfect for your home, office, garage, work space or anywhere else.Our countertop support brackets work well in supporting counter tops. [Easy Installation and Wide Application]The flush installation of our hidden shelf brackets is made easy with countersunk screw holes for added support.Each set of 3 packs .Our concealed countertop overhang brackets are suitable for various countertop materials, perfect for warehouses, counters, offices, kitchens, drawing rooms, and more. Our package includes 3 packs of hidden knee wall brackets. The heavy duty concealed knee wall brackets are of high quality and extremely solid. Colour:Black Material:Metal Size:A:12in Package Contents: 3 x floating shelf for wall