PK50B1/8 is a molded phenolic control knob from the PK Series designed for rotary control applications. It features a straight knurl texture with a white indicator dot on the skirt and a spun aluminum inlay for enhanced appearance. The knob has overall dimensions of 0.748 inches (19.0 mm) diameter (A), 0.570 inches (14.5 mm) height (B), and accepts a 1/8-inch shaft with a No. 6-32 set screw for secure mounting. This knob is commonly used in electronic equipment, instrumentation panels, and audio equipment where precise control and visual indication are required.