This turning knob with collet fixing from Mentor is a metal, high-gloss, chrome plated instrument knob in precision format. * Axle diameter: 3mm * Colour: Chrome * Height: 14mm * Knob Ø: 8mm * Manufacturer's part 487.3 https://elecena.pl/product/27736441/mentor-487-3-turning-knob-with-collet-fixing-8mm 2025-01-22 https://elecena.pl/product/27736441/mentor-487-3-turning-knob-with-collet-fixing-8mm 2025-07-16 https://elecena.pl/product/27736441/mentor-487-3-turning-knob-with-collet-fixing-8mm 2026-05-01 https://elecena.pl/product/27736441/mentor-487-3-turning-knob-with-collet-fixing-8mm 2026-07-07