This is a pack of two optional XRAY 12mm Aluminum Wheel Hexes, with an additional 0.75mm offset. These CNC-machined, premium aircraft aluminum 12mm wheel hexes add a 0.75mm offset for wider track-width. Strategically machined for optimum strength, balance, and lightness, each hex is notched for easy identification. Package also includes two mounting screws for secured hex to axle.