MIDWEST 5 Blade Duct Crimpers feature a 1-5/8 in throat depth which corrugates the end of sheet metal duct or stove pipe for insertion into another sheet metal duct or stovepipe assuring a tight fitting joint. Equipped with KUSH'NPOWER compound leverage handle action with patented (US D718,602, D719,808) handle grip design multiplies handle force while providing a soft, sturdy and comfortable grip. KUSH'NPOWER grips and heavy duty double overwind spring are unconditionally guaranteed. Made in USA.