Holds 1/4", 3/8" and 1/2". Keeps all sockets in one place in your tool box. It accommodates a wide range of sockets and attachments including regular, long, universal, and extensions. Has convenient carrying handle to carrying them to the job and avoid returns trips to the ones you forget. Easy to spot a missing tool Tray loaded with tools is heavy enough to stay put without fastening in place, even when removing sockets from the rack. Rack tray is 6" x 18" metal frame with four 17" socket racks.