Micro Drill Adapter 1/64" - 1/8" Keyless Chuck Features include... 1/64" - 1/8" Chuck Capacity Precision sensitive drill adapter Finger control Reduced Drill Breakage Easier small hole drilling Consistent precision operation, runs without down time. Multiple operations on a single set up Applicable in mills lathes, drill presses and jig borers. 47.50mm Closed Length 44.00mm Open Length 24.50mm Sleeve Diameter 35000 Maximum RPM 3/4" travel Easy operation, grasp free turning ring, feed with gentle finger pressure, auto return upon release Has 0 JT male taper.