There's not a lot to say about a product like this.  I bought these for extra support under my outdoor spa. They do the job. The Amazon description leaves a lot to be desired but if you go to the Akron website you will get an accurate description of each model. I would suggest doing that to be sure you order the right size. The post does not attach in any way to the bottom flange, it just sits on it. If someone kicked the post hard enough it would slip out.  That could be a concern in some situations. The vendor, BIC, was excellent. Product arrived on-time, well packed and they sent a personal follow-up email to see if I was satisfied. It's the first Amazon vendor who has ever done that.