凹形螺母 M20 工品汇科技（深圳）有限公司

p1Src=//y2.yzimgs.com/uploads/531837/2019712-114526118.png?watermark/2/text/5rex5Zyz5biC5pav5Zu-5Yqg54m556eR5oqA5pyJ6ZmQ5YWs5Y-4/font/5a6L5L2T/fontsize/300/fill/I0E3QTlBOA==/gravity/SouthEast