5 Pc ATI Magnavon High Speed Microstop Lot with Quick Chuck Shaft Aircraft Tool,with Quick Chuck Shaft Aircraft Tool 5 Pc ATI Magnavon High Speed Microstop Lot, It uses standard 1/4-28 threaded bits, Made in the USA,They have ball bearing ride with a quick chuck shaft, Lot with Quick Chuck Shaft Aircraft Tool 5 Pc ATI Magnavon High Speed Microstop.