... quality,competitve price. 2.Many types. boltBolts and Nuts Fasteners bolt and nut Material:carbon or alloy steel ... range:40mm-460mm4.Using:petrochemistry,metallurgy,power,pipelineaccessories etc5.Grade:8.8,9.8,10.9,12.96. ... range:40mm-460mm4.Using:petrochemistry,metallurgy,power,pipelineaccessories etc5.Grade:8.8,9.8,10.9,12.9 ... 2,Tariff-freeZone,Qingdao,Shandong,China. good quality hex bolts and nuts