The set of 20 open shelf brackets is designed to fit wood boards 4 inches deep or deeper. Mix and match a variety of boards with l shelf brackets to style your wall shelves in the kitchen, , corner in a variety of looks, from sleek and modern to rustic farmhouse or industrial. Pack of 20 shelf brackets to allow you to add more brackets to hold more weight easily. Heavy duty black metal shelf brackets can hold up to 60 lbs per pair (2 pieces). The floating shelf bracket set comes with necessary screws. You can quickly mount with wooden shelf brackets. Color: black Material: metal Package Contents: 20 x brackets (3 x 4 inches) 60 x small screws 60 x large screws Only the above package content, other products are not included. Note: Light shooting and different displays may cause the color of the item in a little different from the real thing. The measurement allowed error is +/- 1-3 cm.