Prepare your semi truck to be Ready for the Road Ahead , with the Euclid 4-3/8" Full Arm Torque Arm Kit that provides enhanced protection against everyday torque. Due to its connection with the axis and the chassis, this replacement kit is able to minimize the amount of twist and torque applied to the axle. Engineered with high strength materials to withstand extreme forces and pressures. FleetPride is your First Click in Heavy Duty .