S9Q New Fashion Bicycle Motorcycle Bike Waterproof Case Bag Cover Mount For 3.5 4.3 Gar GPS Fits all handlebars 18mm - 33mm in diameter. ^ Included inside is dense foam material to damp vibration and push your satnav unit against the screen.^ Case features waterproof zip, touch through front panel and bottom entry for GPS cables. Accepts 90% of 3.5" & 4.3" GPS units & some 5" GPS units.^