9-Piece Set: 3x 1/4" socket drives (48 Clips), 3x 3/8” socket drives (45 Clips), 3x 1/2" socket drives (36 Clips), which holds up to 129 sockets. This socket rail tool accepts both shallow and deep sockets, Metric or SAE (Inch) sockets. High Compatibility: Fits almost all brands of sockets and removable end cap, add or remove clips easily. Red 1/4-inch, Blue 3/8-inch, Black 1/2-inch driver socket. Heavy Duty Molded: Tool socket holder rail constructed from ABS; The socket clips with spring loaded ball bearings to hold your sockets firmly and securely; End caps constructed from soft plastic (caps removable). Convenient to Use: Use the socket tray as socket organizers for toolboxes drawer to organize your toolbox, socket organizer as you mount on a wall vertically or horizontally. Easy to Organize: The portable sockets organizer is so easy to use that you'll get your messy sockets organized in no time. Simply unbox the tray and start clipping your disorganized sockets on the socket tray.