This knife has been designed and re-designed countless times. Mantis wanted to be certain that; when stepping into the dive knife arena, we included everything that was truly necessary in a SCUBA tool. Serrated on one side, smooth edged on the other, blunted tip for prying and for secondary use as a flat head screw driver. The most innovative feature though, the eject mechanism on the sheath. Depress the sides and the knife fires into the users hand for a very quick draw.