Spring loaded, locking trap door Sure-fire, adjustable trigger Strategic mesh pattern Easy baiting and releasing Made in the USA Model 603 is designed for squirrels, muskrats, and similar size animals. It weighs 3 pounds and measures 19L x 6W x 6H. It is contructed from 1" x 1" - 14 gauge galvanized wire mesh. It has an easy release rear door.