Hi Don I actually use a lot of different shapes because I used them for boxwood carvings that I did on my Bellona model. There are several I use all the time in my flexible shaft machine but the ball shape would be the all round mist useful. if you have a 3/32 collet for your dremel they will work just fine. Hold the phone and I'll go down to my workshop and jot down the ones I use most I'll be back in ten minutes Cheers Ed
