I have had no luck finding a replacement one of these for my tool box. The one in the picture is a 5/32"; the one I lost and wish to replace is a 4mm. It is a 1/4" hex drive allen wrench with 4mm tip.
Never mind that 5/32" is 3.97mm and that the 5/32" one will work wherever I need the 4mm, the hole in my tool rack bugs me every time I open the box.
See for yourself!!

The stores I have tried either don't have it at all, or they want to sell me a $25 set to get the one piece I need.
Anybody got one of these kicking around they don't want?
tanstaafl.