I purchased this on Amazon, but accidentally bought two, so I'm selling one. The adapter for attaching to a phone case can be reused many times with 3M super-strength double-sided tape, etc. It can be attached to the stem, so you can securely hold your phone. You can attach and detach your phone with one touch. I will disassemble the box and ship it via Nekopos. Bicycle Phone Mount Mountain Bike Phone Holder Universal Aluminum Handlebar Stem Phone Clamp Cycling Phone Clip MTB Road Bike Quick Install/Release