(1)Head: bugle head, phillips, wafer
(2)Material: carbon steel, alloy steel
(3)Size: all sizes
(4)Finish: Zn plated, Oxi

Standard Model:DIN ANSI JIS ASTM

(1)Head: bugle head, phillips
(2)Material: carbon steel, alloy steel, etc
(3)Size: all sizes
(4) Finish: Zn plated, Oxide...