M3 M4 Allen Hex Socket Button Head Screws Bolts 3-50mm Grade 10.9 Steel DIN 7380
● Standard: DIN EN ISO 7380 ( ISO 7380 ) ( GB /T 70.2). Grade 10.9 Steel Hex Socket Allen Socket Button HeadScrews Bolts Machine Screws DIN 7380. ● Thread Size: M3, M4. ● Head Style: Hex Socket Allen Socket Button Head.