Gedore SL 1916 Tool holding rail 1/2", magnetic, 580 mm External squares to take 16 standard commercial 12.5 mm (1/2") sockets Two female square adaptors to take ratchets, sliding T bars, extensions etc. A strong magnet securely holds the socket rail to ferrous metals Additional holes are provided for wall mounting the socket rail or attaching to non-ferrous materials The sockets are securely locked by the ball at the square-drive end by turning them 90 degrees It is a simple matter to "unlock" and remove the sockets, by turning them 90 degrees in the opposing direction Delivery without tools