american mutt tools 5 blade sheet metal crimper tool – crimp 24ga steel and 28ga stainless – stove pipe crimper tool, duct crimping tool, hvac crimper tool, duct crimper tool, gutter crimper tool - AMERICAN MUTT TOOLS Blade Sheet Metal Crimper Tool Crimp 24ga Steel and 28ga Stainless Stove Pipe Crimper Tool, Duct Crimping Tool, HVAC Crimper Tool, Duct Crimper Tool, Gutter Crimper Tool. 4.4 out of 5 stars.. in the past