... #, 40Cr, 35CrMoA, 42CrMoA, 25Cr2MoVA, 35VB, 40CrNiMo,Stainless steel and so onSizeM6-M42 LengthM16-300Type of headSquare,Hex,Flange,Hex ... socket,T-Head and other you can chooseSurface treatmentBlack Oxide,Zinc plated,hot ... dip galvanized,Dacrotizing plated and your requirementOthersWe can make accroding to your drawing or ...