Heads up position provides better viewing angleAerodynamic low profile designSecure dual stage lock (Patent Pending)Can be rotated for over stem mountingSuits handle-bar sizes 31.8mm and 25.4mmProduct DescriptionThe Quad Lock Out-Front mount works with your Quad Lock phone case (sold separately) for easier viewing and improved aerodynamics. The mount attaches easily to either your handlebars or stem?? allowing you to customize phone placement to best fit your bike.