Bellows Coupling (set,clamping screw ) 1.steel,stainless steel; aluminum 2.Steel,Black Oxide Finish,Stainless Steel 3.ISO9001 Bellows Coupling (set , clamping screw )Place of Origin: Zhejiang,ChinaBrand name: BulkTEK1.steel,stainless steel; aluminum2.Steel,Black Oxide Finish,Stainless Steel3.ISO9001:20084.OEMBulkTEX couplings are available in one and two-piece designs, with and without keyways, ...