... Size:M16-M64 Use:petrochemistry,metallurgy etcFasteners bolt and nut1.Material:Low-carbon steel,high tensile mid-carbon steel,alloy steel(35#,45 ... Size:M16-M64 Use:petrochemistry,metallurgy etcFasteners bolt and nut1.Material:Low-carbon steel,high tensile mid-carbon steel,alloy steel(35#,45 ... (qingdao Office):NO.2,Tariff-freeZone,Qingdao,Shandong,China. good quality hex bolts and nuts