The Davies Molding LLC part 1230-J is a 20mm round knob made from black thermoplastic elastomer. With a height of 18mm, this knob is designed to provide a comfortable grip and easy maneuverability. It features an M6 diameter flatted to an M4.5 mounting hole, ensuring a secure and interference fit. This knob is not only functional but also visually appealing, making it a versatile choice for various applications.