Love these. We use these for vinyl fence post installations when we need to pin a post. Core drill a 3" hole into ledge, concrete, rock ect. and use pour rock to cement a 1 7/8" post into cored hole. Use two of these stiffeners on the 1 7/8" pipe then slide the vinyl post over the brackets. Vinyl post is still height adjustable and it makes for easy repairs if the vinyl post ever need to be replaced. Been using these for years.