From the manufacturer's site:
"Inverter starts as a conventional Broadhead, then INVERTS to an enormous EXPANDABLE for quick, humane kills!
INVERTER was designed for the Bowhunters, who demand a conventional broadhead but would like the devastating cutting power of en expanding blade broadhead.
When shot, the INVERTER has a legal 7/8 inch cutting width in a closed position and looks like a conventional broadhead. When it hits the target the blade indentations catch on the hide and INVERT the blades to a huge 1-1/2 inch cutting width.
INVERTER cuts closed or open & flies like a field tip!"