... ASTM, JIS, BS, AS, ISO, GB, Nonstandard bolt High quality Countersunk Head Nylok machine Screw model numberM3.5-6Brand NamePhoriaOriginal of PlaceSuzhou ChinaMaterial1018 ... or Photos or Samples to us 1.High quality, competitive price 2.As many factory use stainless steel 200 or 400 series ... is specialize in producing various kinds of special screws. High quality Countersunk Head Nylok machine Screw