The device was designed to catch problem raccoon while avoiding non targets, such as cats and skunks. Attach this to the front of the trap over the door and place a small amount palatable bait on the outside and inside lip and at the back of the trap to catch those problem raccoons. Raccoons pull the screen down while cats and skunks dig at the bottom unable to get in. This product works better with the dura poly traps or traps with trap covers.
Small: Fits 9"x 9" traps
Large: Fits 12"x12" traps