LBK Boring Extension Reducer 1.Used on boring machine 2.For deeper boring 3.Suit ... all over the world, such as carbide inserts,machine tool holder,collet chuck,drill chuck.turning tool ... ,lathe holder,end mill,endmills,milling cutters,boring tools,boring head,boring ... drills,u drill,nuts,wrenches,screws and other machine accessories etc. And we have obtained good reputation ...