Great space saver on shelves when doing production work.
Universal Insert Bat, which saves a great amount of shelf space doing production work with a small "footprint".
The outer 13" bat is 1/2 inch thick Medex and the 5.5" square inserts are 1/4 inch Duron which fit flush with the top of the outer bat.
Duron - Often called "Masonite" is 1/4 inch thick, smooth on both sides
Medex - Wood product without formaldehyde, 3/8 inch thick. Handles clay like wood or Duron. Water proof, no warping, extremely strong. Will not degrade like particle board.