This was the product I was looking for! Nothing is square in my old Victorian, which makes sealing around doors pretty difficult. In addition, our steel back door has a huge (uneven, of course) gap all the way down the handle side of the door. I bought so much "off the shelf" weather stripping, tried layering multiple types, etc., with the end result being a fair seal (at best) and an impossible to lock door. This was PERFECT for that door. Deep enough to seal against the widest point in the gap...