The Mentor 4311.4131 control knob is black and measures 20 mm in diameter and 17 mm in height. Manufactured by Mentor, it is ideal for adjusting volume or settings on audio equipment and appliances. This control knob is typically used in electronic devices requiring precise manual control. https://elecena.pl/product/28918285/mentor-4311-4131-control-knob-black-xd8-20xh17mm-pointer-collet-1piece 2025-06-07 https://elecena.pl/product/28918285/mentor-4311-4131-control-knob-black-xd8-20xh17mm-pointer-collet-1piece 2026-07-07