The Sub Gear SK-21 Knife is a Diver's Tool. This Knife is available in 2-Model Choices, Corrosion Resistant 304-Grade Stainless Blade or Corrosion Proof and Lightweight Titanium. Both Models come equipped with a Straight Edge on one side and a Serrated Edge on the other. The Blade Tip is a Drop Point Design and the Knife also comes with a Line Cutter on the Blade. The Butt of the Knife has a Metal Cap which is handy as a Hammer Device making this one versatile Dive Tool. The Ergonomically Designed Hand Grip gives positive retention even when wearing thick gloves and the Wrist Lanyard Hole comes in handy when you attach a Lanyard and need to let the knife go. The Knife Blade measures 4.7" (12cm) and the knife comes with a Thick Strong and Durable Plastic Sheath with Push Button Knife Release and Leg Straps for mounting the knife. Knife is covered by a 12 month limited warranty.