Grooved Top Bar/Grooved Bottom Bar Frames.
Carton of 8. 18% more wood in end bars ( Full 3/8" Thickness) Grooved bottom bar is stronger and easier to use. Foundation is placed in bottom bar groove and top bar groove. This frame works best with Perma-Dent or Rite Cell foundation Fits 9 5/8" hive bodies (Deep Supers)