No price negotiations ❌ No bulk purchase discounts ❌ Please refrain from individual negotiations. You can purchase directly without any rejection comments. I try to ship within 24 hours, so I will not comment until the item is shipped. Thank you for your understanding. Set of 4 Purchased from the USA. Unused, deadstock knobs made of plastic. They are called "radio towers" because they resemble broadcast towers. A wonderful design not found in Japanese products. Uses a 1.5mm wrench to secure the set screw from the side, compatible with both internal and external pots. Maximum outer diameter: approximately 28.6mm, height: approximately 15.6mm, shaft hole diameter: approximately 6.5mm. Use for repairs and customization of vacuum tube amplifiers, tube amplifiers, stereos, antique radios, audio equipment, guitar amplifiers, and effectors, as well as for dressing up bizarre guitars. The 5th image is a size reference image. The 6th & 7th images are reference images of installation examples. * If you let me know in the comment section before purchasing, you can change to "Yu-Yu Mercari Mail Yu-Packet" (anonymous delivery) for an additional 50 yen. You can purchase directly without any rejection comments. Recycled materials are used for packaging.