The Simple Squirrel trap, as the name implies, is a simply effective design, with one interior spring-loaded door. Very easy to set, the Simple Squirrel Narrow trap measures 17"L x 3"W x 4"H. The trap is constructed of 1" x .5" mesh and is narrow enough to fit comfortably in a gutter. The Simple Squirrel Standard measures 17"L x 4"W x 4"H. Both can be set sensitively enough to capture chipmunks, while it is large enough to accomodate gray squirrels. Last but certainly not least....the price, it CAN'T BE BEAT !!!