This is an exact replica of the Pultec CC-04-001 Bakelite bar pointer audio equipment knob, used on 1960's radios, filters, EQs, lab equipment, and more. This knob was also used in the 1960's television series, Lost in Space. It was used on several props, most notably the Robinson family's faithful robot companion (commonly known as Robot B9). I modeled this directly from an original that I purchased, after countless measurements were taken. This model includes threads as found on the original part. Eagle eyed Sci-Fi fans will also spot these lenses in many other films and shows through the 60's and 70's.This is a part known and loved by both the prop enthusiast and audiophile communities.