Thule TracRac SR Toolbox Mount Kit Mount your toolbox without drilling or bolting - avoiding rust or corrosion Slide your toolbox back towards tailgate for easy access Slide your toolbox off - quickly and easily Mounts to underside of any toolbox - check to confirm that the belly of the box fits between the TracRac base rails (on most trucks, the width of the belly of the box, needs to be 61" or less)