> The size of the tool usually depends on what machine you're using them on,and whether or not you're using a quick-change toolpost.
Most of the mini-lathes are based on using 5/16 blanks.
I think the Hightower uses 1/4 as standard.
All that is null and void with a QC toolpost,as the cutting height is adjustable.
I recommend getting blanks in several sizes,preferably a name brand,and the higher the cobalt content,the better.
Don't let them get so hot they turn blue,and keep the grinding wheel fresh. Tommy D.