Get F - total failure! Failure to fulfill the declared main function. It's too short to fit in any standard bimini binding. I removed the spring - even then it's still too short. I then removed the o-ring and ground down the first raised flange leaving only the outer one. Now it fits - like, but without the spring and O-ring. Yes, I have a stripped down version to "kinda" work, but without a spring it's not secure and can rattle for free. Do not purchase this product for the quick detach bimini. Search for the right one.