Keyless Drill Chuck Maximum Capacity: 5/16 Minimum Capacity: 0 Mount: 1JT
I was happily surprised to see only .001 runout. I measured at the outer edge of the taper, about 1/4" in, and as far as I could reach with the DTI. I lost the picture, but unhappily surprised that it jumps up to about .0025 to .003 with the cheap Enco arbor.