I rather short 5/16" HSS twist drill bit that has a 1/4" shank with a flat notch cut into the shank so that a set screw can secure it.
I would like to get more sizes than just 5/16 but I don't know what this type of bit is called.
The box it came in says Greenfield Industries (now KennaMetal) and I looked in their online catalogs but couldn't find any matches.
Anyone know where I can find more bits like this?
--zeb