The metal housing available for the martins are very popular. The only house that offered a trap was the Trio "Spar-o-door"
Robert was the FIRST to develop a trap that fit a variety of housing whose interior dimensions do not exceed 5-1/4 inch x 4-3/4 inch x 4-3/4 inch. Traps the bird unharmed.
Made from vinyl coated wire material with a powder coated shutter door. This trap works, plain and simple.