Hex Head Flange Bolt,Carbon Steel,Stainless Steel; Natural Color; Grade 4.8 8.8 10.9 12.9; Available in Size of M4 to M60 Please Choose The Main Specifications 1.StandardDIN, ANSI, ISO, JIS, BSW, GB And Non-Standard Items2.MaterialCarbon Steel, Stainless Steel3.Surface TreatmentPlain, Zinc Plated, Black, Hot Dip Galvanized, Etc.4.SizeM5~M20