This works with iPhone4 & 5 models or any phone with the same width. I also used a 3/4" PVC pipe which slides in. V2.b should work better without having to sand anything down. V3.b has a slot in the back to allow use of both cameras. V4 is a wider body for wider phones and cases. Edit I added a V2.b and a V3.b which I feel is a little sturdier. Edit 2 Yeah, it's pretty much designed for a timer, and it was a hit for it's intended purpose. For crowded events it worked great. The fact I sized it for 3/4" PVC pipe allows for endless possibilities. A few connectors and then you can hold a pole up high and take a crowd shot. I thought I might make a setup to put on my bike since I don't have a go pro but I have some spare phones. This was made using TinkerCad and basic shapes. I had to sand the PVC on my first try but have scaled the hole a little bigger.