Jim, they are either ER25 or ER32 (The three little ones on the right are a different size to the others). Clean them up, get a collet chuck and you're in business. In essence as long as you have the right size you can use it to chuck things up in the lathe. Because you get much better contact with the workpiece they are much better than a three- or four-jaw scroll chuck. Frankie, how would Jim measure to see what size collets they are?