Here's something I've been wondering for a while, as an industrial electrician I use SAE nutdrivers several times a day, usually 1/4,5/16,7/16, sometimes 3/8,11/32,1/2 and 9/16 and very rarely 3/16 (kooltronics vfd cooling fans only) 7/32 (mit a700vfd ethernet cards) and 9/32 resi lite fixtures...