a torque - limiting driver includes a housing , a shaft carried by the housing for rotation relative thereto and having a workpiece - engaging tip projecting from the housing , a torque - limiting mechanism coupled between the housing and the shaft and responsive to rotation of the housing in a predetermined direction to rotate the shaft at torques below a predetermined torque and accommodating rotation of the housing relative to the shaft at said predetermined torque and above , a torque - determining structure disposed in the housing and movable relative to the torque - limiting mechanism for adjusting the predetermined torque , and the housing including a stop portion engageable with the torque - determining structure for preventing torque - adjusting movement thereof .