Isolated brake bushing for more effective control. Bind-free design with sealed housing and grease fittings for easy maintenance. Built-in travel indicator to monitor acceleration travel and deceleration travel. Heavy duty design to handle open class modified motors. Add a second brake bushing for even wider brake tuning options. Comes with 1 brake bushing. (2) 21208Y, 21208B or 21208R torque bushings required--sold separately.