MIDWEST® 5-Blade Duct Crimpers feature a 1-5/8″ throat depth which corrugates the end of sheet metal duct or stovepipe for insertion into another sheet metal duct or stovepipe assuring a tight fitting joint. Use in either hand. Equipped with KUSH’N-POWER® compound leverage handle action which multiplies handle force while providing a soft, sturdy and comfortable grip. Made in USA!