Bicycle Head Stem Mount with 1inch Ball (sku 16729) Bicycle Head Stem Mount with 1" Ball for 1 1/8" Star Washer bike stems. Strong secure mounting base. Machined from solid billet aluminum. British made. Fits 1 1/8" Star Washer Stems only - not suitable for Quill Stems. Fitting - Tighten to manufactures torque setting 1" ball base is compatible with RAM motorcycle mounts, SW-Motech and Ultimate Addons mount accessories. Also available with 2 prong, 3 prong or 4 prong adaptors and as complete mounting options for mobile smartphones and GPS satnav systems - see separate listings.