Snap-on 1/4" drive adjustable torque screwdrivers with pin retention (Nos. QDRIVER2A, 3A, 4A and 4NMA) can be used on jobs that require precision and low torque. Easy to use, all the user has to do pull the knob out, turn it to the desired torque setting and then push the knob back in to lock in the setting. Can be used on sensors, actuators, fuel pressure regulator brackets and fuel filter brackets. The pin retains the socket to the square drive. Torques only in the clockwise direction; accuracy within ± 6 percent (from 20 percent to 100 percent full scale).