I ordered five of these for various bikes and they all fit perfectly and work exceptionally well. Gone is the side to side swivel making the lights hard to put on or takeoff with one hand and they stay perfectly aligned unlike the similarly priced mounts from the radar light manufacturer. As an improvement, it would be nice to have the seat post type marked either inside the packaging or marked on the box because when you order several different types for several different bikes, you have to figure out which one goes with which. It's simple enough but some of the D shaped posts are pretty similar but not exactly alike. I ordered these in the Western USA and from order placement to receiving them was about nine days so this is very good since they are coming from Australia. My only wish is that I could get a light mount for my Reilly Fusion, not exactly a high volume bike, so they are not likely to ever make one of these for that bike. Overall an exceptional product! One final note, make sure you read the installation instructions which are linked at the bottom of the Concentric Cycling website. I am glad I checked before installation because without doing that you are likely to over torque them. It is a maximum of 1.5NM for the mounting screw. I would highly recommend to Concentric Cycling that they print right on the box 1.5NM max.