I've never had to use anything like this before. It seems well done. The welly has been marked with various sizes in both metric and standard sizes from the top of the boot to where the rubber connects to its base. The position of my vent was in the wrong place. The rib on the metal roof ended where I had to place the base of the boot on the rib and just barely level with the roof. The bottom of the boot bottom appeared to be marked with screws every inch or so. I didn't drill them out because that's where the rib was. The fit was perfect and all materials were flexible enough to be easily worked with. I would buy another one if I need another one.
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