This is the ScubaPro Mako Titanium Scuba Diving Knife 3.5" Blade with Serrated Edge, Line Cutter Features: Made from hardened titanium for light weight, long life and corrosion-free cutting performance. Conventional edge slices easily through numerous materials. Serrated edge is ideal for sawing through heavier ropes and branches. Line-cutting notch is able to handle small rope and fishing line. Bottle opener is provided for after-dive convenience. Knife handle offers plenty of gripping area as well as a thumb guard to keep the knife from slipping. Sheath&';s unique locking mechanism allows for one-hand release. Includes kit for mounting knife onto a BCD. The MAKO TITANIUM knife is so light and compact you won&';t even know it&';s there, yet its titanium blade is incredibly strong, resists rust, and has the hardness to take and hold a sharp edge. The MAKO TITANIUM offers a multi-function blade that includes a serrated edge for sawing through rope, a conventional edge for making clean slicing cuts, a line-cutting notch, and a bottle opener. The Tanto tip, with its angled shape, is one of the strongest knife points available. The knife&';s handle offers plenty of gripping area as well as thumb guards to keep the knife from slipping. Included is a locking sheath. This is an excellent corrosion-resistant, maintenance-free, general-purpose dive knife. "