So you have a New Style 4 spoke steering wheel but have no way to mount your Gauge. This is the solution for you. This Shim mounts under the steering wheel and the extension arm comes up between the 2 rails on the steering wheel. They are available with a 10º or 15º angle which helps reduce fatigue by providing more ergonomically correct steering position. They also are available with no angle and are 7mm in thickness. Precision CNC machined 6061-T6 aluminum, black or gunmetal anodized for long lasting corrosion resistance.Compatible with the MyChron4 Gauge.