Includes: - 4x Retainer Cages (006-190-00) - 4x 5-57 1" ID D Washers (005-023-00) Spindle "D"Washer Size:OD: 1.625" Width: 0.125" Thick 1/8" 1" D Washer Fits Newer EZ Lube Dexter Axles made after 2002 3,500-6,000 lb Apply to fix 6K to 8K and 9K built prior to 10/89 Standard for Dexter Axles With and W/O EZ Lube Trailer wheel/axle retainer Fits most axles from 2K to 8K It is the retainer used by Dexter on all new axles. With this style, after setting the nut, you do not need to clamp the cotter pin and retainer on top of the nut, it is much better than the cotter pin and lasts longer.