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Perfect Vision Non-Penetrating Roof Mount Pitch Pad - 37.5 Inch x 37.5 Inch (NPRMAT8)These mats are designed to be used under non-penetrating roof (NPR) mounts like our NPR6B and NPR8. No holes need to be drilled in the roof surface with those mount designs but a pad should be used under the frame to provide a small buffer between the metal angle a..