SunsbellBicycle Bike Riding Cycling Case Cover Waterproof Pouch Bicycle Handlebar Bag for iPhone 5 iPhone 5s iPhone4s Heavy duty suction cup and lock clip to make sure your devices stays in place Soft foam inside two mounting arms to hold the product anti-slide, shock-proof, and anti-scratch Waterproof proctective case with Transparent Touch Through Cover If you need two or more than two, we can give you a 5% off sale price, please contact us after your purchase. The diameter of this Bicycle Mount Holder is 20mm. Choose the best section to fix.