Knives

Size

Typically, a Large Dive Knife has a blade over 5 inches, while a Medium Dive Knife has a 4 to 5 inch blade, and a Mini Dive Knife caps off at 2-3 inches.

Large Dive Knives: Size is important, because a big dive knife is not always the best choice. Large dive knives can be awkward and heavy, hard to manipulate in a tight space without causing damage to yourself or your equipment. A dive knife is almost never used as a weapon, and it may be best to consider the practical application of your new knife before making a purchase.

Medium Dive Knives: By far the most practical dive knife, a medium sized dive knife has the heft and mass you'll need without the ungainly length of some larger dive knives. Medium dive knives are convenient, and can often be strapped to a variety of easy-to-reach locations, including your BCD, your arms, or your legs. The hilt is still long enough to get a firm grip, so you never sacrifice strength for size.

Mini Dive Knives: For a compact profile, nothing beats a mini dive knife. With a 2-3 inch blade, a mini dive knife can fit anywhere you need it to go, including clamping it onto a hose for quick access. An important tip - make sure that the handle is longer than 2-3 inches, so that you can get a firm grip on the knife, even through thick gloves.