a universal shelf bracket composed of three basic interlocking components held together and adjusted by a screw and rectangular nut . the bracket engages a pair of vertically aligned slots in a vertical wall and can be adjusted to fit a variety of slot spacings and depths . the bracket is constructed so that its tabs are both flush with the same outer wall while still allowing the bracket to fit squarely in the slots . left and right brackets can be constructed so that two brackets can be engaged to one common pair of vertically aligned slots .