This Apex exclusive metric double-end jam nut wrench includes 41-43MM sizes to fit jam nuts both with and without our ninja lockwasher tabs bent over on the connecting rod. These low-profile wrenches function just like 'crows-feet' and are designed to be used multiple times. Apex has these wrenches available in 9 sizes. These wrenches have a 1/2" drive for use with a torque wrench to allow installers & alignment shops to get accurate torque values. This wrench is laser-cut from 3/8" A36 plate and tested to 250 ft/lb with no measurable deflection or distortion. They are RAW STEEL and will rust if left unpainted. If carrying in your rig, we recommend painting these a bright color in case they fall in the dirt and you need to find them! These wrenches are manufactured here in the USA in Ozark, Alabama by Motobilt exclusively for Apex Chassis This product carries our Apex Honor System warranty.