·40CR夹板,支架钢材铸就,更耐用 ·表面处理,耐腐蚀 ·适用于管材扩孔拼接 ·适用管子外径:3/16", 1/4", 5/16", 3/8", 7/16", 1/2", 5/8" ;4, 6, 8, 10, 12, 14, 16mm