Five Hole Bee Escape Board

The main panel is 6 mm or 9 mm plywood, the upper rim is 9 mm x 22 mm material and the underside rim is 63 mm. (see notes on clearer boards page about alternative 22 mm deep rim dimensions) I would use a 22 mm deep rim if I were to make any more.

The red cone escapes are fitted from underneath into 22 mm diameter holes.

I do have one of these units in my kit. I can say that it works, but I cannot give any relative effectiveness to the other types as my original data is "lost" and I can't remember how good it was when I actually tested it. I can say that it was not outstanding in performance otherwise I would have adopted it for more widespread use.