Billy is the black 36"wide single wall shelf which features aged brass and knurled support pole hardware. Each shelf unit is 36"W and 12"deep. Shelves are 1" thick x 36"w x 12"D. The shelves are secured to the wall using a 'french cleat'. The metal cleat is easily attached to the wall with proper mounting to a stud or wall mount. The 2nd cleat is hidden on the back side of the shelf for hanging. Minor assembly and wall mounting. We suggest a max 20 lb weight load. Coordinates: Billy coordinates with the Arnold 3 tier black/aged brass 36" W shelf unit. Materials: mdf shelf, aged brass finished metal.