The Dorman 76899 Control Knob Assortment is a collection of control knobs specifically designed for use in car and truck HVAC systems. Made by the brand Dorman, known for producing high-quality automotive parts, this assortment ensures that you have the right knob for your specific vehicle's heating and cooling controls. Each knob is durable and designed to function seamlessly within your car or truck's HVAC system, providing a convenient and essential accessory for maintaining and repairing your vehicle's climate control system.