• External squares to take 12 or 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° • It is a simple matter to “unlock” and remove the sockets, by turning them 90° in the opposing direction • Delivery without tools