Mushroom Head Square Neck Bolt 1.Standard:DIN,GB,JIS,ANSI,Non-standard 2.Coating: plain,zinc,nickel, phosphate black 3Grade Features:1 ... 2) Material: Carbon steel3) Dimension: According to your requirement 4) Coating: plain,zinc,nickel, phosphate black 5) Packing:Boxes or Bulk ... bolt in picture is DIN603, SIZE: 1/4" DIN603 Mushroom Head Square Neck Blots