Wide Fits: the motorcycle fork stem ball base is specially designed to fit into the cylindrical bore wall of fork stems. It fits for Yamaha YZF R1M/S R6 R6S, for Kawasaki Ninja 400 250 650 1000SX ZX600 Ninja ZX-6RR ZX-14R ZZR, for CBR 250R 300R 400R 650R 600RR 600 F4I, for BMW S1000RR Suzuki GSX 1300R GSX-R 600 750 1000 Hayabusa, for Ducati V2... Super Stability Installation: with innovative honeycomb ball design, this 1" fork stem ball adapter provides greater grip on Ram/ iMESTOU 1" ball phone mounts by the concave and convex surface! With six sets of expansion plugs, this 1 inch ball adapter fits for fork stem holes with diameter from 0.47"-1.18"/12mm-30mm. 1 Inch fork stem ball adapter can widely suitable for Ram B size ball phone mounts, iMESTOU 1 ball phone holders. iMESTOU Motorcycle Fork Stem Mount 1 Inch Ball Base Adapter Suitable for Ram/iMESTOU B Size Phone Mounts, Fits for 12-30mm Stem Holes, Works with Yamaha/Kawasaki Ninja/BMW/Suzuki/Ducati Motorcycles