This trap measures 7 x 5 1/2x 171/2. It is equipped with a large bait hook in the center of the trap cage. when your critter attempts to pull bait from the hook, the double door spring system is activated, and your trap door slams shut. Very simple to set, no reaching inside, and it can all be done from the outside of trap. There is plenty of room so the animal does not feel that confined, and is eager to enter. Good for squirrels, flying squirrels, weasel, mink, rats, chipmunk, and like animals of this size.