hex bolt 1.Surface:black,phosphated,galvanized.. 2.Grade:4.8,8.8,10. ... ,42CrMo high strength hex bolt, hex cap bolt, balck bolt1. Surface:black oxide, phosphated,galvanized, Dacrotized2. Grade:4.8, 8.8 ... , very reasonable price and good service What we can garantee:(1) Produce as per your request(2) Strict quality control(3 ...