The peak is calculated through the top from the strip to the bottom of the strip. The holes can be found .75" down in the best of your strip. Our PVC strip vary consists of: ambient temperature; freezer-quality; ribbed; transparent coloured; opaque coloured; anti-static; anti-insect; perforated; frosted; and welding grade. https://optimusbookmarks.com/story18115926/pvc-strip-curtain-no-further-a-mystery