SP25MM11 is a heavy-duty adapter that allows you to mount a 25mm ball mount or pedestal to motorcycle mirror frames, handlebar pinch bolts, or other areas having a 11mm bolt head. (Mounts, holders, and devices sold separately.) Secure the adapter onto any area with a 11mm bolt head by threading the bolt through the adapter. This adapter is a great alternative for those tight areas on a motorcycle or other vehicle where a drill base or suction mount won't work.