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