Main jet for the small body 22mm Small Body Mikuni carbs. Also referred to as "Chinese" Mikunis. These are also what is typically used in Mini-Bike & karts due to the lower cost. M5 x .8mm Thread
Will not fit any other Mikunis (such as Large Body Round Slides, Flat Slides, etc)
Note: Not all Small Body (Chinese) Mikunis use the .8mm Thread. Some (esp those a few years old) use the .75mm Thread. Other than the thread size, the jets are the same. The thread size is close enough that with mild force (and a drop of oil), either jet can be used.
NO RETURNS ON JETS
MAKE SURE PICTURE & THREAD MATCHES YOUR JET