Fiskars Aviation Snip Expansion Set

"Experience advanced mechanics and ergonomics with a new generation of HVAC tools that deliver more comfort and control. PowerGear technology better applies your power to make cutting and seaming HVAC ductwork easier. This ingenious technology helps utilize more of your strength by preventing overextension without sacrificing performance. An ergonomic, spring-assisted handle fights fatigue and features soft grip for enhanced dexterity and comfort. An investment-cast, heat-treated steel head and handle improve strength and durability.