#2 mt shank part of #2 mt shank is turned straight to 5/8 dia so it can be used in 5/8 collet and still work in # 2 taper nicely done 1/32-1/2 drill capacity chuck opens and closes while spindle is running great for center dril,l drill, tap operations speed job up by not having to turn spindle of, for rotating spindles will not work in lathe tailstocks works perfectly