Unique design actually grips steering knuckle for extra strength. Combined with a super strong 12mm grade 12.9 bolt, this is a sturdy solution. Height adjustable from .50" to 1.25" in 1/8" increments by positioning 3 spacers above/below steering knuckle. Articulates an impressive +/- 27 degrees to prevent binding at full compression and droop. Bump steer is a change in toe setting resulting from vertical wheel displacement. A car that bump-steers requires constant adjustment at the steering wheel to maintain a steady trajectory over uneven surfaces. This can be handful to drive. The 911/914 series has some bump steer inherent even in the stock configuration. The problem becomes more severe with lowered ride ...(choose a part on the right to read more)