I have tried other boat mirrors and they all have attachment points which means I only see myself in the mirror unless I move out of the way and I do not I don't want that. I want to be able to see what's behind me at a glance. This is PERFECT - I can put the transom higher than me or to the side so in a second I can see the boat moving behind me. THE BEST BOAT REARVIEW MIRROR YOU COULD FIND! There are others that are triple the price but this one is economical, sharp (big mirror) and as I said gives me the right rear view.