成人免费观看高清在线毛片,黄色往站,日本免费视频观看在线播放,日本黄色小视频在线观看,一级黄色片视频,日本黄色大片网站,日本黄色大片网站

Nut type tensioners:

Nut type tensioner is suitable for mechanical fastening connection. According to its own strength, it can be used for medium and high strength bolts or screws. According to its own material and structure, it can be used in different working conditions. It is a nut type tensioner suitable for all places where large hexagon nuts are used.