The RAM® Motorcycle Fork Stem Wedge Ball Base - 12-18.75mm Holes (RAM-B-342W-1U) is a low-profile mounting base designed to attach directly to the cylindrical bore wall of motorcycle fork stems that measure 12mm to 18.75mm in diameter, keeping your device front and center. Featuring a B size 1" rubber ball, this base provides a secure mounting point for a wide range of RAM® double socket arms and device holders, enabling near-infinite adjustability for optimal viewing angles. The rubber ball design dampens vibration and shock, helping to protect your device while riding on rough terrain and at high speeds. Built from marine-grade aluminum with a powder-coated finish, this base is engineered for durability and corrosion resistance in outdoor environments. Backed by a lifetime warranty, this base ensures reliable performance wherever the road takes you.