1.High Tensile Socket Head cap screws 2.Quality: 12.9 2.Surface: Galvanized, ... Black oxide 3.Material:ML40Cr 4.CET:TS16949:2009 Hexagon Socket Head Cap ScrewsSpecification:1. Quality:10.9;12.92. Surface ... ,DIN933,DIN931,ISO7379.Packing:Workshop:Laboratory:Exhibition:Training: High Tensile Socket Head cap screws