Thrust Bearing Kit for Coil-Over Shocks. 2.500" ID x 3.225" OD, Roller Bearings. Includes 2 thrust bearings and 4 steel washers. Kit will work with any coil-over or coil-spring that has a 2.5 in. Inside Diameter, 2.5" ID. Pair. Kit makes adjusting coil-over shocks easier by using a roller bearing system at the base of the coil-over's coil-spring an spring retainer. For the greatest effect, combine this with an adjustable spanner wrench for the most ergonomical and simple way to adjust performance coilover shocks.