Tool bit or tool holder for power tool

A tool comprising:

• an input shaft having a substantially cylindrical front portion and a rear portion with a shank configured to be removably coupled to a power tool;
• an output shaft having a substantially cylindrical rear portion and front portion configured to be coupled to at least one of a tool bit and a threaded fastener and a rear portion;
• a plurality of recesses defined in one of the front portion of the input shaft and the rear portion of the output shaft;
• a plurality of apertures defined in the other of the front portion of the input shaft and the portion of the output shaft, the plurality of apertures spaced radially outward from the plurality of recesses;
• a plurality of rollers received in the plurality of apertures;
• a substantially cylindrical spring circumferentially surrounding the rollers to bias the rollers radially inwardly to selectively engage the recesses, such that torque is transmitted from the input shaft to the output shaft when the rollers engage the recesses, and torque transmission from the input shaft to the output shaft is interrupted when the rollers do not engage the recesses;
• and
• a control sleeve having a first portion with a first inner diameter and a second portion with a second, smaller inner diameter, wherein the control sleeve is received over and is axially moveable relative to the spring between a first position in which the first portion surrounds the spring and the rollers, and a second position in which the second portion surrounds the spring and the rollers,
• wherein when the control sleeve is in the first position, the first portion of the control sleeve enables expansion of the spring and movement of the rollers out of engagement with the recesses when an output torque threshold is exceeded, to interrupt torque transmission from the input shaft to the output shaft.