This tool cuts insulated flexible round duct and also cuts the duct liner’s wire rib coil. Pointed bottom blade easily pierces duct to start cut. A heavy duty wire cutter is located away from scissors blades and is capable of cutting liners hardened wire rib. Thumb operated latch ensures that sharpened blade edges stay closed when not in use. Compound leverage provide smooth scissors cutting action and a big 4 3/8 cutting length makes the job go even faster.