This means they will fit your environment beautifully so any paint, dust or Grime is not going to stain or scratch the surfaces underneath. Drill holes are positioned 20mm in from the corners applying an 6mm drill little bit. You should make sure crucial info on your artwork avoids these https://www.indigosupplies.com/blogs/news/protect-floors-and-surfaces-with-correx%C2%AE-temporary-floor-protection