This is the B84 & B84D Carbon Fiber Steering Plate W/ Threaded Insert. The 1mm threaded insert gives you +3 and +5 steering geometry for smoother steering feel. Simply reverse the direction of the insert to achieve which one you want. These mounts also eliminate the need for a lock nut allowing you to do quick change steering adjustment.

Also can be used on the B74.2 CE, B74.2D CE, B74 & B74D