The precise pull-to-adjust, push-to-lock adjustment knob and easy-to-read window scale make this micro-adjustable torque driver like no other. This 1/4" Hex driver has a spring-loaded, high security bit holder, which uses all standard drive bits. It has a cam-over torque limiting clutch for repeatability and accuracy with torque accuracy of ±6%. Certificate of accuracy supplied with each driver. You can easily identify tools set at different torque values with colored end cap. (sold separately) (USA)