The HD Switch Fork Caster Spindle Rebuild Kit Includes Everything Needed to rebuilt one fork spindle. This Kit Includes 2 Taper Roller Bearings with cup and cones, and 1 Lower Grease Retaining Seal with Bore Sealant Coating for a Perfect Seal and Garter Spring Upgrade to Keep the Grease In and The Dirt Out. Garter Springs are Highly Effective and used on Almost all Automotive and Trailer Applications.