These cardboard guard tubes are 5 3/4 inches long with a 5/16th ( 8mm) hole and have a 0.040 inch thick wall which, Chalcid Wasps cannot ovipost through and lay eggs which will destroy your developing Mason bees.
Reusable when used with removable paper liners.
There are 2 types of cardboard tubes available. For dry climates the regular tubes are best, for wetter climates water resistant tubes {1 cent per tube extra} are recommended. Select your choice in the "Tube Type" window near the "Add to Cart" button.
