The Motacorsa Quick Release Steering Wheel Boss is an aircraft quality aluminium CNC manufactured construction which is hard anodised for strength and durability. Finished in gold.The male and female splines are precision gear cut incorporating a master spline. The master spline allows you to accurately align the wheel when in position.Brings the Steering Wheel 50mm closer to the driver.Bolt to Boss. Group N - (allows you to use the quick release mechanism in conjunction with any aftermarket steering wheel boss that has a 6 x 70mm PCD steering wheel fitment e.g. Sparco, Momo, OMP)Brings the steering wheel 50mm closer to the driver.