... brass, copper, alloyFinishPlating, Oxiding, Blasting, Painting, Anodizing, Heat treatment, AlodineTolerancehexagon socket screws: +0.0004/-0, +0/-0.0004 inchStandard DIN912,913 ... ISO certified manufacturer – Freerun Group Strict quality control for hexagon socket screws by IQC, IPQC, FQC, SPC, PCP, PPAP to ... contact us to ask for catalogues and price list. Top Quality Hexagon Socket Button Head Screws