The SP ConnectTM MOTO STEM MOUNT lets you mount your smartphone to your supersports motorcycle in seconds.; For sports motorcycles (clip-on handlebars); Vibration dampening; Portrait / Landscape Orientation Option; CNC machined from aircraft grade aluminum; Stainless steel hardware; For diameters 12-30mm: 12-15mm, 15-18mm, 18-21mm, 21-24mm, 24-27mm, 27-30mm; For diameters 15-35mm: 15-19mm, 19-23mm, 23-27mm, 27-31mm, 31-35mm; 1x Moto Stem Mount; 5-6x Diameter Adapters