PFF80-1102GBLK Front Wishbone Rear Bush Caster Adjustable has been designed around our unique on-car adjustable Nylon/Polyurethane Ball-Joint combination for more direct steering input and improved cornering and braking. The offset bore allows for +/- 0.5-1.0   of caster adjustment with the supplied spanner, to assist in the fine-tuning of the side-to-side caster settings. Vertical stiffness is increased considerably over standard rubber.  Using a  Black 95A durometer  ball moulded to  an all-new offset stainless steel sleeve and  machined nylon cups,  this new and improved design maximises performance and articulation while  retaining  the benefit  of on-car adjustability.All come pre-assembled with the ball and cups encapsulated within a plated metal outer shell secured by snap-rings and now include a 27mm spanner for adjustment.