--material aisi 440A, aisi 420 (more appropriate for salt water). plus hardening
--size small (10cm minus blade), good grip (with hand protection)
--one wavy cutting edge for rope and naylon
--for spearfishing use should be like a stilleto (dagger), for fish euthanasia
--easy and safe reach, at any position the diver may be (usually the knife should not fall out when the diver removes the safety)
ps. same time ago, i designed a knife, I had it cut with lasercut, and gave it to a Cretan knife craftsman (the ones that have visited Chania in Crete know
). The result was a knife that could cut just looking it.... but it was made out of aisi 316L ...
its tip bended while cutting butter
