The AllPoints Foodservice Parts & Supplies 221033 is a durable black plastic knob designed for electrical applications. Measuring 2 inches in diameter, this knob features an Off-High-Med-Low configuration, allowing for precise temperature control. It mounts with a .240-inch shaft and is designed to sit flat on the surface. This knob is compatible with burner valve #52-1015 and is suitable for use with Duke, Warmer Aerohot, and Thurmaduke equipment, ensuring reliable performance in foodservice environments.