The Steering Coupler U-joints utilize the latest in CNC machining technology. The U-joints are made out of the highest quality steel and have been thoroughly tested. Similar to OEM automotive U-joints, the staked needle bearing caps prevent loosening and adjustment malfunction.The shaft is a DD that can be easily trimmed to exact length needed. Shafts are 12" in length as received. Also available are vibration reducers (Detroit Speed recommended) which significantly reduce vibration in the steering wheel and have also been shown to increase the overall life of the steering components.