This flange works great
Your review: We use the Kee Klamp items for shopping cart corral railing in retail stores. Our customers like the galvanized pipe look. This works better than using regular plumbing pipe because it does not require threading.
Pros: holds larger anchor than other flange offered. Two set screw allow for more secure hold on posts.
Cons: Lead time is about two weeks. A little pricey but saves labor.