The KB500B18AL is a solid aluminum control knob from the KB series, featuring a straight knurl for grip and a line indicator on top for position marking. This model comes in a black anodized gloss finish and is designed to fit a 1/8 inch diameter shaft, secured by #6-32 set screws for positive retention. The knob has an outer diameter of 0.500 inches (12.7 mm) and an overall height of 0.630 inches (16.0 mm). Constructed for durability, this functionally rugged knob is ideal for various control applications in instrumentation, audio equipment, and industrial panels.