Constant Diameter LBK Boring Extension Rod 1.Used on boring machine 2.For deeper ... such as carbide inserts,machine tool holder,collet chuck,drill chuck.turning tool,lathe holder,end mill,endmills,milling cutters ... tools,boring head,boring bar,tool holders,drills,u drill,nuts,wrenches,screws and other machine accessories etc. And ... agenting our products. Constant Diameter LBK Boring Extension Rod