KN500B1/4 is a black machined aluminum control knob featuring a straight knurl surface with indicator line and arrowhead indicator design. The knob has a maximum body diameter of 0.500 inches (12.7 mm) and is designed for use with a 1/4" shaft, with a shaft length of 0.251 inches (6.38 mm). Key dimensional specifications include a body diameter of 0.445 inches (11.3 mm), a bore diameter of 0.374 inches (9.50 mm), and a height of 0.625 inches (15.9 mm). The knob is secured with set screws and features a 120-degree indicator line for precise positioning. This knob is commonly used in electronic equipment, test instruments, and control panels where reliable manual adjustment and clear position indication are required.