... NINGBOSpecifications(1). Product: Fitting bolt(2). Standard: (3). Grade:10.9(4). Size: M6-M36(5). Material: Carbon Steel(6). Surface ... onSizeM6-M42 LengthM16-300Type of headSquare,Hex,Flange,Hex socket,T-Head and other you can chooseSurface treatmentBlack Oxide,Zinc plated ... sampleRegarding to Nuts Type of NutSquare,Hex,Flange,Hex socket,T-type,Coupling,wheel ,acorn,tapper,and so onRegarding to ...