The Bettie Ball Gimbal Mount Knob from Redrock micro enables you to attach the Redrock Bettie Ball mount to a Freefly MoVI Accessory Mount. The Gimbal Mount Knob is machined from aluminum and features a wide diameter knurled knob for tightening and loosening. This is a lightweight, low profile, and rigid solution for use with the Bettie Ball mount when you want to attach an optional display to your MoVI handlebars.