A tang or shank is the back portion of the blade component of a tool where it extends into stock material or connects to a handle – as on a knife, sword, spear, arrowhead, chisel, file, coulter, pike, scythe, screwdriver, etc. One can classify various tang designs by their appearance, by the manner in which they attach to a handle, and by their length in relation to the handle. Nakago is the term in Japanese, used especially when referring to the tang of the katana or the wakizashi. Full vs partial tang A full tang extends the full length of the grip-portion of a handle, versus a partial tang which does not. A full tang may or may not be as wide as the handle itself, but will still run the full length of the handle. There are a wide variety of full and partial tang designs. In perhaps the most common design in full tang knives, the handle is cut in the shape of the tang and handle scales are then fastened to the tang by means of pins, screws, bolts, metal tubing, epoxy, etc. The tang is left exposed along the belly, butt, and spine of the handle, extending both the full length and width of the handle. Partial tang designs include stub, half, and three-quarter tangs, describing how far the tang extends into the handle of the tool. The most common partial tang design found in commercial knives is on folding knives, where the tang extends only as far as the pivot-point in the handle. Scalpels, utility razor blades, and a number of other knives are commonly designed with short partial tangs that are easy to fasten and unfasten from the handle so that dull or contaminated blades may be quickly exchanged for fresh ones, or so that one style of blade may be exchanged for another style while maintaining the same handle. Hollow-handled knives also incorporate a partial tang. Many inexpensive knives and swords designed for decorative purposes incorporate partial tangs and are not intended to be used for cutting applications. A full tang knife or sword generally allows for increased force leveraged through the handle against the resistance of material being cut by the blade, an advantage when used against harder materials or when the blade begins to dull. A full tang also increases the amount of stock metal in the handle of the tool