Good/excellent built in chuck. The only downside is the tool handle depth, <1.5" for 1/2" diameter tools. The older version of the 5/8 chuck I had could handle larger diameter double ended center drills (or end mills if I was in a hurry). My expensive workaround was to buy long double-ended center drill bits and then cut them in two with a cut-off saw. Once long/normal, then once short/dampening.