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If SHTF and you have no way of chopping wood, this may just save your life! When you need to cut something down to size, using your pocket knife is not always the best option.While a pocket knife can be used to cut small limbs and other items, doing so will quickly dull the blade and make it useless for other purposes, like skinning, as food is a high priority.
One of the most simple ways to cut up branches, limbs, and even pvc pipes when a power saw or hack saw are not available is by using a wire saw. Heck, as a last resort I would use this as a weapon!