... quality and services; Certification:ISO14001 ISO9001 SGS Specifications Custom made bolts screws Xiamen Haixingcheng Metal Products Co., ... etc.SizeM0.8~M12MaterialStainless, Steel,Brass, Steel,Bronze, Iron,Aluminum,Carbon steel,Alloy steel, silicon bronze,etc.Head/ ... Tread stylesAccording client's requiresCoating/Surface treatmentZinc, ...