A sheath knife is a fixed-bladed

knife A knife ( : knives; from Old Norse 'knife, dirk') is a tool or weapon with a cutting edge or blade, usually attached to a handle or hilt. One of the earliest tools used by humanity, knives appeared at least 2.5 million years ago, as evidence ...

that fits in a sheath of

leather Leather is a strong, flexible and durable material obtained from the tanning, or chemical treatment, of animal skins and hides to prevent decay. The most common leathers come from cattle, sheep, goats, equine animals, buffalo, pigs and hog ...

or other material such as

nylon Nylon is a generic designation for a family of synthetic polymers composed of polyamides ( repeating units linked by amide links).The polyamides may be aliphatic or semi-aromatic. Nylon is a silk-like thermoplastic, generally made from pe ...

kevlar Kevlar (para-aramid) is a strong, heat-resistant synthetic fiber, related to other aramids such as Nomex and Technora. Developed by Stephanie Kwolek at DuPont in 1965, the high-strength material was first used commercially in the early 1970s a ...

. The sheath is used to protect the knife and as a carrier. Most importantly, the sheath protects the person carrying the knife (e.g. in the pocket or hanging on the belt) from potentially serious injuries that the sharp, unprotected blade could easily cause. To provide sufficient protection, sheaths made of soft materials, such as leather, often have reinforcements, inside or outside of the sheath, made of metal sheet or other suitable materials having sufficient strength. The blades vary in size, shape and construction. In Australian law, "sheath knife" has a different definition. In this case, they are a type of non-folding, fixed-blade knife which has "a sheath which withdraws into its handle", thus giving something of the effect of an " out-the-front"

flick knife A switchblade (aka switch knife, automatic knife, pushbutton knife, ejector knife, flick knife, Stiletto, flick blade, or spring knife (Sprenger,Benson, Ragnar (1989). ''Switchblade: The Ace of Blades''. Paladin Press. pp. 1–14. . The sw ...

. These knives, like flick knives, are classed as "prohibited weapons" in Australia. *

Pocket knife A pocketknife is a knife with one or more blades that fold into the handle. They are also known as jackknives (jack-knife), folding knives, or may be referred to as a penknife, though a penknife may also be a specific kind of pocketknife. A typ ...

Sliding knife An OTF Knife, also known as an out-the-front knife, sliding knife, telescoping knife, or angel blade, is a pocketknife with a blade that opens and closes through a hole in one end of the handle. This design contrasts with the majority of utility ...

References

2.Torefy https://torefy.com/best-kitchen-knife-guards/ Knives Fur trade {{Knife-stub