Abstract: An adjustable support bracket having a unitary or multi-member bracket assembly can be used with a vertical channel (2) and rail (6) construction. Each bracket assembly can be positioned and secured at any location along the rail (6) and can accommodate a varying shelf thickness. More specifically, the multi-member bracket assembly includes a stabilizer member (12) and a support member (20) having similar shaped channel plates which when joined have a similar shape to the channel (2). A spring (30) mounted between the stabilizer and support members (12, 20) is contained between the rails (6). The spring (30) in conjunction with a containing lip (14) and a supporting lip (22) of the stabilizer and support members (12, 20), respectively, adjusts to clamp a shelf (32) therebetween. A securing screw (33) locks the bracket (10) at any shelving location by creating a space between the stabilizer and support members (12, 20) within the vertical channel (2).