Prevents overtightening or uneven tightening of lug nutsReduces risk of wheel and brake rotor damageSpring steel design stops turning once preset torque is reachedSolid one piece constructionLaser etched with size and torque rating for easy identificationIdeal for Freightliner FLD and other late model Class 8 TrucksSpecifications. Size 1 in. 33 mm. Drive Range 550 ft. per lbs. Weight 4.5 lbs