My application is a “skylight”. I have no frame support other than a hole insert. I asked and order specifications call for 2 “D” rings on ends so that I can manage the inset from either side. I have just 1 “D” ring poorly placed and not able to set the Indow insert straight in the skylight hole. I have the window shoved up in the hole, but not sure it is a correct fit. The Indow arrived without hardware - that was quickly corrected and pins shipped shortly after. I am waiting for someone to FaceTime me so that they can look at my skylight fit. I have it jammed in the hole for now. —- Initial customer service was fantastic. They even helped me with measurements over the phone. Just not sure my Indow is fitting as it should. — shipping and packaging was very good