If you look at the pad kit instructions, it has square pads that sit in the bottom of the gutter and fasten with the included bolt. You will probably need to get a washer and a locking nut for the inside as there is no tread, unlike the pad kit instructions pic which show the internal tread for the roof. Check your roof, you can probably see the plastic plugs from the inside, I can see mine. The holes are easily accessible. Make sure to seal the pads and the hole with sanitary silicone to preven