DIN 3124:2007-11

Square drive socket wrenches for screwing and unscrewing hexagon bolts are operated by hand. The tools used to operate these wrenches are e. g. Tee handles, cranks, ratchets, spin-type handles - all with male square. With respect to short sockets marked with footnote b in Table 1 and Table 2, this standard is in compliance with the International Standard ISO 2725-1.