●Fits USA Fender, CRL, Oak Grigsby Switch, etc. but will not fit China/Japanese/Korea metric size switches. Commonly for telestyle 3-way switches, but can also be used with Strat or Tele3/4/5-way level switches ●Switch knob has a switch blade slot that is approximately 4.9mm in length ●Made in Japan, Material: Plastic, Round ●Please make sure the width of the popping knife is 4.9mm before purchasing ●Package included: 2 pcs