... machine screw Size:M3.5-6 Material: Stainless steel 1018 Standard:ASTM, JIS, BS, AS, ISO, GB, Nonstandard bolt High quality Countersunk ... Head Nylok machine Screw model numberM3.5-6Brand NamePhoriaOriginal of PlaceSuzhou ChinaMaterial1018 ... in producing various kinds of special screws. High quality Countersunk Head Nylok machine Screw