17mm ball head interface

提供两种常用的17mm球头接口，无需五金件，可以负担轻量物品。Two common 17mm ball joint interfaces are provided. No hardware is needed and it can bear lightweight items. 如果对你有用的话，请给我点赞，If it's helpful to you, please give me a like. 如果使用过程中有什么问题的，可以给我评论。If there is any problem during use, you can give me a comment.