Buybits Quick Fix Callaway uPro MX Golf Trolley Mount (sku 15962) The Quick Fix clamp base attaches easily to almost any style of frame, bar & rail. Fits bar with a diameter between 20mm - 40mm. Suitable for most oval & round even square frames. Wide opening jaws - up to 40mm. Jaws have a ribbed liner to eliminate slip, protect frame and reduce vibration. Tightening screw with securing lever holds firmly to the bar. No tools required to fit - completely removable Fit & remove in seconds. Includes an adjustable cradle - Substantial sized cradle offers secure support. Push button release arms. Retaining lip prevents GPS slipping forward.