If you're a professional who travels abroad often or otherwise find yourself in dicey situations, you need a rod saw.
What other device allows you to cut through almost any material with nothing but a small thin rod and as much time and patience as you can manage? A small rod saw, easily concealable on your person, and a little know-how is all you need to be sure that you can escape just about any restraint- from rope, to cord, to metal chain.
There are two primary types of rod saw available- carbide and diamond.
A diamond wire blade is simply a wire impregnated with diamond dust of various sizes, but don't underestimate its strength. The diamond dust enables the wire saw to cut through nearly any material: rope, cord, metal bars, chain-link, etc. Any material softer than the ultra-hard diamond surface can eventually be cut through with time and patience. A diamond wire blade will be more expensive for obvious reasons, but is more brittle and, with a thinner diameter, may snap.
What a carbide rod saw may lack (compared to diamond) in hardness, it makes up for with its overall strength. In addition to greater affordability, a carbide rod saw is thicker in diameter than a diamond saw, and much less brittle and less likely to break during use: a crucial attribute if you find yourself in a life-or-death situation.
For less-dense materials like rope and cord, a cord saw is your best friend. Quicker to use for lighter materials than a rod saw, a cord saw is equally small and concealable.
The keys to successfully using survival saws are practice and persistence. Get a feel for how they works with different materials and the best stroke speed and length for each before you find yourself in a survival situation, and we guarantee you won't regret keeping one of each with your everyday carry.