KNS501BA1/8 is a machined aluminum control knob featuring a straight knurl grip with an arrowhead indicator positioned on the skirt for precise position indication. The knob has a two-toned finish with a black body and natural top, providing visual distinction and professional appearance. Key dimensional specifications include a 0.500 inch (12.7 mm) diameter body, 0.445 inch (11.3 mm) knurl height, and 0.750 inch (19.1 mm) skirt diameter, designed for 1/8" shaft mounting with two No. 6-32 set screws. The knob is constructed from machined aluminum, offering durability and lightweight performance suitable for control panels, test equipment, and industrial instrumentation applications where reliable grip and clear position indication are essential.