This is a fail-safe live center accessory for pen turners. Mandrels usually bend when you tighten the tailstock center point into the end indentation of your mandrel. This system solves that problem because your mandrel shaft goes through the hollow live center. The pen bushings press against the center with zero pressure on the mandrel shaft. The tube and bushing assembly tightens up by turning your tailstock quill adjustment wheel. This is great for beginners and professionals. This is the perfect pen turning accessory, whether you are turning a full pen or a bottle stopper.