A heavy-duty collet handpiece with sealed ball-bearing construction, it comes with a pin and wrench for changing collets, as well as 1/8" and 1/4" collets. A collet chuck has the tightest grip of any style. This #44T handpiece has a tapered front end for a comfortable grip. It can be used in the Foredom Model SR or Model S machines or the Dremel #7360 Carver.