Fender Japan Genuine Hat Knobs. These were originally on a Telecaster with two humbuckers and a two-point knife-edge tremolo that I purchased in the early 90s. I believe it was part of the Boxer series. Overall, there are few scratches and stains, but the white numbers on two of the four knobs are faded. The other two knobs have almost all of the white remaining and are in good condition. The holes that fit onto the shafts are the type without serrations. The measured inner diameter is approximately 5.75mm. Since they are Fender Japan, I believe they are metric size. They are not the side-hole set screw type. Please consider purchasing only if you understand that these are old parts. * The description of the condition is subjective and there may be oversights. * Please understand that this is a private transaction of used goods. * Please feel free to ask any questions in the comments section.