国产一区 久久久_91精品视频国产一区_亚洲国产中文精品综合色区_久久久国产一区精品_国产高清亚洲日韩一区二区三区_后入颜射美女高颜值内射_69式国产真人视频_av淘宝在线二区_97黄色视频观看免费_亚洲一区高清

Material: P20 steel

Surface treatment: polish, Sand blasting

Service life: 10,000-1 million times