The no-nonsense Winkler Knives WK Bottle Opener Knife looks lifted straight from Batman’s utility belt thanks to its 80CrV2 blade steel construction with a no-glare, black oxide finish and skeletal tang. There’s a handy bottle opener to the back of the blade, and a molded sheath with lanyard. The brand is in fact a favorite of superheroes of other kinds– elite US fighting forces.