The 81A1A-B28-A15L is a 5/8" square single-turn panel control potentiometer manufactured by Bourns, designed for on-off function control applications. It features a metal shaft and bushing with consistent, smooth quality feel, and is available in up to 4 sections for multi-section assemblies. The device offers a plain 3/8" diameter bushing with 3/8" length and a 5/8" shaft length, with anti-rotation lug options for secure mounting. It is RoHS compliant and provides reliable performance across standard resistance ranges with linear and audio taper options. This potentiometer is ideal for industrial control panels, audio equipment, and consumer electronics requiring durable, smooth rotary control with precise positioning.