... 8M (SS 316), B 8 T (SS 321), A 2, A 4Freeun produces custom hexagon socket screws per customers' drawings or samples ... by IQC, IPQC, FQC, SPC, PCP, PPAP to provide customers with quality hexagon socket screws. We would support your small demand on hexagon ... other rc parts,please contact us to ask for catalogues and price list. Top Quality Hexagon Socket Button Head Screws