Convert any Comstock 12x12 trap into flush mount trap with this adapter. When a trap is set with the door open, the door extends a few inches past the trap frame which prevents it from being flush mounted. However, flush mount adapters extend the length of the trap past the open door, allowing the trap to be mounted flush against a wall or any other structure. To use, place the flush mount adapter in position against a wall and over the animals den opening. Model C1212FMA measures 7L x 12W x 12H and is constructed of 1x1 - 14 gauge wire mesh.