★sizing specification：For M3: The inner diameter of the thread is 3mm. It needs to be used together with a washer with a diameter of 3mm and an M3 screw.
★Standard: ISO/DIN/ANSI/ASME/ASTM/BS/AS/JIS
★Material: 216 / 316 / 304 / 45# or customizable.
★Grade: 4.8 / 8.8 / 10.9 / 12.9
★Surface: BZP / HDG / BLACK / DACROMET / TEFLON or customizable.
