INVISIBLE SHELF BRACKETS - Unique side anchor design. You will find that the floating shelf supports 'disappear' when using a board thicker than 3.8 cm. Now mount this sturdy shelf bracket to add a functional touch to your kitchen, bathroom, bedroom, etc. Rustic aesthetic: rustic style with matte texture. Attractive black shelf bracket made from high quality steel with black powder coating, heavy and delicate. Sealing and rust are also necessary for industrial shelf brackets. STURDY - High quality 5mm integrally formed steel plate. No welding structure for the rustic floating shelf bracket. Heavy duty shelf brackets can hold over 45.4 kg (100 lbs) on concrete walls. We recommend you to keep the space between 16 and 32 inches. Package Contents: in the box, there are 6 shelf brackets of 15.2 cm and high-quality anchoring hardware. 24 x concrete dowels, 24 x long screws, 12 x short screws. Choose the right screws to install the rustic shelf support as you wish. Dedicated Customer Service:Our goal is to provide you with the best product and service. We are responsible for every black shelf bracket. Please let us know for any problems or suggestions. We promise you a satisfactory solution.