Mushroom Head Square Neck Bolt 1.Standard:DIN,GB,JIS,ANSI,Non ... standard 2) Material: Carbon steel3) Dimension: According to your requirement 4) Coating: plain,zinc,nickel, phosphate black 5) Packing:Boxes or ... Bulk ,Cartons in Pallet ,According to customers' requirements6) Grade: 4.8,5.8, 6.8, 8.8 or GR2,GR57 ... ) The type of bolt in picture is DIN603, SIZE: 1/4" DIN603 Mushroom Head Square Neck Blots