Mantis DEHT19 Review – Cuts More Like a Chainsaw? The Mantis DEHT19 is all about its blades, which prompted one consumer to say it “cuts more like a chainsaw” than your ordinary hedge trimmer. Meaning, it is that powerful. What’s its secret? Its easy-to-maneuver 19-inch blades. They’re dual-reciprocating, double-edged, and carbon-steel stamped. Aside from the …