Kit includes a CNC-machined aluminum adjuster and a 17. 5" long steel arm. Adjuster is available in 30 degree or zero drop with 1-1/4" x 49 or 1-1/2" x 48-spline. On cars with limited ground clearance, the zero drop kit positions the arm at the center line of the adjuster for additional ground clearance. Adjustment bolt has detents to lock at each half turn.