Boker Beluga Dive Knife. Skeleton version of BO-590 Orca Tactical/Dive Knife. All stainless X15 T.N. steel construction with non-reflective bead blast finish. 10 1/4" overall with 5 3/8" partially serrated blade. Holes in the handle provide for better grip under wet conditions. Cordura sheath features a hard polymer insert and leg strap.