This Korean Industrial Standard specifies the sockets for manual socket wrenches of 12.7mm square drive to be used as assembly or disassembly tools for the hexagonal bolts and nuts.
KS B 3007-1-1999 history
2013KS B 3007-1-2013 Socket wrenches-Part 1:12.7 mm square drive
2009KS B 3007-1-2009 Socket wrenches-Part 1:12.7 mm square drive
1999KS B 3007-1-1999 Socket wrenches-Part 1:12.7 mm square drive