Victor threaders must pass the VSI exam, which is very demanding. Students must pass a very strict and high-standard written test and service skill test in order to successfully obtain the A-level threading qualification certification of Victor Threading College. Therefore, those who can pass the A-level threader are excellent.

A threader is a person who threads badminton rackets. The wear and tear of the thread sometimes directly determines the performance of the athletes. Blood boiling on the court, super assists off the court. The threader is a wonderful "behind-the-scenes hero" in the knitting field.