Shank for Long Milling Planes are 1" longer and cool down 1" shank. Then only 16 center bolts will fit (regular Milwaukee hole heavy duty bits) unless you have a $300 90 degree bit). Why doesn't anyone do that in the 6" version? The short one is too small and clogs easily, this one is too long. A long shaft isn't necessary. If you need more, you'll probably need a lot more and buy the 10" anyway - or longer version. Also the flutes can be sharper (Mo Betta stone mine now)