... China; Certification:ISO14001 ISO9001 SGS Specifications Half thread flat head ribbed neck bolt with zince plated Xiamen Haixingcheng Metal Products Co., ... .6, 4.6, 4.8, 5.6, 6.8, 8.8, 9.8, 10.9, 12.9 etc.SizeM0.8~M12MaterialStainless, Steel,Brass, Steel, ... Bronze, Iron,Aluminum,Carbon steel,Alloy steel, silicon bronze,etc.Head/Tread stylesAccording ...