Each crimp from this tool creates long, shallow double crimps that replicate factory indentations. These longer shallower crimps result in a tighter fitting, more self-supporting, leak-proof connection. Made with nickel plating to help resist corrosion and hardened steel for greater strength and resistance to abuse. The Malco 5-Blade Sheet Metal Crimper also features comfortable ergonomic RedLine Handles. These handles offer non-slip handle grip contours, spring handle actuation and a thumb-operated handle latch. The engineered handle opening of the tool compliments the natural power stroke of any users hand.