These Yeah Racing RMX 2.0 Aluminum Steering Knuckles are a low-profile set for MST's RMX 2.0 or FMX 2.0. Built in is a removable steering stopper which allows you to run extremely large steering angles without the fear of locking up the steering. These knuckles are CNC machined from quality aluminum, given a black anodized finish with silver chamfered edges.