The 11K5020-KCAB is a control knob accessory manufactured by Grayhill, designed as a standard fit for Grayhill encoder and rotary switches. This Style 5020 knob features a spring clip (press-on) version with a 0.250 inch diameter shaft and is available in black color (B designation) with ABS material construction. The knob has a maximum outer diameter of 1.090 inches (27.69 mm) and a base diameter of 0.710 inches (18.03 mm), with a height of 0.730 inches (18.54 mm). The spring clip attachment mechanism provides a secure, tool-free installation suitable for optical and mechanical encoder applications. This knob is ideal for applications requiring reliable control interfaces on industrial equipment, instrumentation panels, and rotary switch assemblies.