The Peterbilt Deluxe A/C Control Knob Diamond is a practical and versatile product that enhances the functionality of your vehicle's air conditioning system. With options for diamond, plain, or diamond indent, you can choose the style that suits your preferences. The diamond options are available in blue, clear, green, purple, and red, adding a touch of personalization to your vehicle's interior. Each knob includes black, blue, and red rubber O-rings for easy installation. Sold individually, this A/C control knob is a convenient and reliable choice for upgrading your vehicle's controls.