I put this kit together because you usually just need one of something, not 300! I've included at least one of each different size and, in some cases, four of each different size. It's all here: fuses, O-rings, cap screws, grease fittings in metric & standard, roll pins, electrical connectors, cotter pins, hitch pins, E-clips, retaining rings, housing rings, and snap rings. A great assortment for your weekend projects. Over 400 pieces! It takes just under one hour to assemble this kit for you. Made in the U.S.A.