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 height and can be extreme with spindle height modifications. This proprietary-design adjustable bump steer kit delivers true adjustability in a super strong package. The adjustable bump steer kit allows bump steer correction by altering the angle of the tie-rods. The kit replaces the tie-rod end (turbo tie-rods only) and allows easy tuning to specific vehicle needs.