KD500A1/4 is a machined aluminum control knob featuring a diamond knurl surface with an indicator line for precise position marking. The knob is finished in natural aluminum and is designed for use with 1/4" diameter shafts. It incorporates two NO. 6-32 set screws for secure mounting and features a 120° indicator line for easy visual reference. The knob's compact design with a 0.500" (12.7 mm) outer diameter makes it suitable for compact control panels and instrumentation applications where reliable grip and clear position indication are required.