How many times have you searched for the right bolt, always having to compromise for both size and quality? These fasteners are "automotive grade," which means grade five (three hash marks on the head) for standard fasteners and grade 8.8 for metric. The quality of both standard and metric is unrivaled by other brands. The metric fasteners are made in Germany and the standard fasteners in the U.S.A. Never use any bolt less than a grade five inch or 8.8 metric on your car. Quality means safety.