The fence collars worked great to convert my old stockade fence metal pole system to a vinyl post over metal pole system. I would not have been able to beautify my property without these.The collars worked great, I recommend the use of a 6’ level with them and good quality stainless steel self tapping screws. For most of my fence panel i used two collars, one 9” from the ground the next 48” above that (my vinyl fence was 6’). Where i had standard 28-42” wide gates i used two collars same setup, for my larger 12’ double-wide car gate I put an additional collar in between. They really worked awesome, I highly recommend these if using existing metal posts for new vinyl fencing.A note to the manufacturer, it was hard to find this product, thank you so much for filling the niche and making my project feasible!!!!