1,steel pipe sleeve,sleeve,welding pipe sleeve 2.size:from 1/4 inch to 4 inch 3.have ability to manufacture all cnc parts 1.steel pipe sleeve,bushing,threaded sleeve joint.welding pipe sleeve2.size:from 1/4 inch to 4 inch3.have ability to manufacture all cnc parts base on clients' drawing or samples4.material could be steel ,stainless steel, copper and so on.5.samples :free steel pipe sleeve