... 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 your sampleRegarding to Nuts Type of NutSquare,Hex,Flange ... ) We have 10years experience of manufacturing fasteners DIN6914/6915 Hex Nuts M12-M33 Bolt and Nut