Each Oneway Live Center features two glass-smooth sealed bearings mounted in tandem for minimum vibration and zero play. The centers are precision machined from premium alloy steel. They are then heat treated, ground, and electro-less nickel plated for strength, accuracy and rust protection. The unique, threaded cup center allows you to easily attach and remove the included accessories. Kit includes the necessary accessories to suit most applications: a center point, bull-nose cone, full-point cone and knock-out rod.