The Peterbilt Timer Knob With Diamond is a practical and versatile accessory for various Peterbilt models. Available in blue, clear, green, purple, and red, this knob adds a touch of style to your vehicle's interior. Sold individually, it is easy to install and enhances the functionality of your timer. With its durable construction and wide range of color options, this timer knob is a reliable and attractive choice for any Peterbilt owner.