How better to get a grip on your load, than with a handful of Back Bone’s own “Knuckle” tie-downs. Usable throughout all Back Bone rack configurations including the headache loops themselves, these versatile tie-downs actually invite use by design. Their proprietary “death-grip” technology helps them stay put under a load, while their ability to be flipped 45 degrees helps them subdue even the most unruly loads. Both Baby Back, and Full Back configurations come standard with a set of four, and additional sets can be ordered as well. Color and finish options are also available.