1. AISI304,durable , good anti-crossion. 2.high precision dia240 (-0.029,0),airconditon controlled. 3.Enviormental painting. 1.materialAISI3042.processforging ,cnc machining, painting3.usagewindmill connector parts,machinery parts,the other equipment parts4.quality controlcritical dimension Dia 240(-0.29,0) 100 percent ZEISS inspection5.net weight3.7kgs,6.8kgs6.strengthspecial process, small ...