Robust construction and handy in use.2 ball-bearing behind and plummer-blockin front.Comes with standard collet: Ø 2,34mm.Other collets available: Ø 0,55 / 0,80 / 1,05/ 1,55 / 2,05 / 2,55 / 3,10 and 3,20 mm.Max. 18.000 U/min.