1.High Hardness 2.High precision 3.No mini order ... DIN911Materialsteel, stainless steel, carbon steel, free cutting steel, aluminum, brass, copper, alloyFinishPlating, Oxiding, Blasting, Painting, Anodizing, Heat ... made by ISO certified manufacturer – Freerun Group Strict quality control for hexagon socket screws by IQC, IPQC, ... catalogues and price list. Top Quality Hexagon Socket Button Head Screws