... steel,45# steel,40Cr,42CrMohigh strength hub bolt, hub bolt and nut, high strenght bolts 10.91. Surface:black,phosphated,galvanized ... certificate: ISO90001:20005. Selling points: reliable quality, very reasonable price and good service What we can garantee:(1) Produce as per ... your request;(2) Strict quality control;(3) very reasonable and competitive price. 153 Rear hub bolt