"Steel tray with 4 rails, 80 socket holders and magnetic base for mounting on tool boxes, lifts or staying in place in drawers","Space saving 18\" x 6\" tray features one 1/4\" rail (24 pieces), two 3/8\" rails (40 pieces) and one 1/2\" rail (16 pieces) or quickly customize its contents to your liking","Nylon holders feature a spring loaded ball detent like a ratchet, for retaining sockets","Keep your sockets organized and portable while it helps increase your toolbox storage capacity MAGNETIC SOCKET RAIL TRAY FOR 80 SOCKETS - GREEN MSH4G | Matco Tools