Answer:The following three types of 2021 nuts are recommended. I personally think they are easier to use. I hope they can help you.1. Bopin M6-M122, Aofeng M123, Kangxuan M6
Answer:Generally, there are only several kinds of marks on the nut, one is the internal logo when the factory comes out. There is also a display of material or level. Generally, stainless steel is basically A2 (304) or A4 (316), indicating that if it is carbon steel, there is