Selecting your scuba diving knives is not as easy as it may seem. You first need to decide how you want to carry it: on your BCD, strapped to your leg, or on your weight belt.
It can be dangerous to wear a knife on the outside of your leg because if you had an emergency and had to ditch your weight belt it could snag on your knife or knife sheeth. So knives should be worn on the inside calf opposite your dominant hand. If you want a BC knife, consider a 3 inch to 4 inch blade because anything larger just gets in the way.
All divers should have a knife with them on every dive. Some diving conditions require both a larger primary knife and a smaller back-up knife. Scuba diving knives really are essential and valuable multil-purpose diver tools.
Blunt tip scuba knives are good for prying and digging whereas knives with the cutter notch are especially good for cutting through fishing lines. Sea sisors and Z-knives are inexpensive options that are easy to use and a great way Stainless Steel knives are cheeper, easier to sharpen and have a wider variety of styles and price ranges but they have a tendancy to rust and have to be carefully cleaned and oiled after each dive. Titanium knives are lighter and hold an extremely sharp edge exceptionally well but when they do need to be sharpened it is harder to sharpen them.
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gets in the way. 
