The Out-Front Mount positions your phone for easier viewing as well as providing enhanced aerodynamics. The mount can be flipped to attach over the stem which is ideal for Mountain Bikes & short or unusually shaped stems. Heads up position provides better viewing angle Aerodynamic low profile design Patented Quad Lock dual stage locking system Can be rotated for over stem mounting Suits handle-bar sizes 31.8mm & 25.4mm Compatible with all Quad Lock Cases