Model E40D-SS is our 4" x 4" Professional Series Excluder Trap. Our Pro Excluders feature an easy release rear door that opens to the side for easy transfer even when mounted; extra wings to create directional funnels when needed; and a toe jammer to prevent even the smartest trapped squirrels from exiting the trap. The multiple catch, one way door allows several squirrels to enter the trap. The rear door allows you to trap the animal or simply remove the rear door to use it as a true excluder. This excluder trap measures 26L x 4W x 4H" and is constructed of heavy duty 1/2 x 1" - 14 gauge wire mesh. It is designed to fit over 4" x 4" or smaller openings.