Fuji-lock hex nuts are made from grade 8.8 zinc plated steel. M6-1.0 Hex Fuji-Lock Nut 10mm Replacement packs for Bolt™ Service Department Assortment Set These kits stack together to save space and include easy-to-read descriptions for each compartment Contains only hardware that is actually used on motorcycles in factory style size and finish Made in the U.S.A. .