... :8.8/10.9/12.9 4.case hardening:HRC38-HRC42 raw material40Cr,35CrMosize1/2''--1.1/4,M12--M36Colorblackgrade10.9/12.9handnessHRC35-42 ... screws, self tapping screws, self drilling screws, set screws, hex socket head cap screws, wood screws.Rivet: solid rivet, blind rivet ... PackageMode of TransportationThe Best Choice for You M12-M36 and 1/2''-1.1/4'' roller bolt