Torque Wrench PROTO

Proto Tools is an American industrial hand tool company. Founded as Plomb, it is presently a division of Stanley Black & Decker. The company is credited with creating the first combination wrench in 1933. Calibrated to ± 6% of torque reading, clockwise at 20% to 100% of full scale. 1/4" Square to 1/4" Hex Adapter included for use with insert bits. Positive self locking lock ring. Aircraft grade aluminum & Aircraft quality spring. Positive self locking lock ring. Floating three-point reaction for repeatability. Laser marked easy-to-read scale. N.I.S.T. (National Institute of Standards and Technology) traceable certification supplied with J6106ACERT. Meets or exceeds ASME B107.14M