Pintongs are used to hold wire, drills, broaches and for other purposes. Sliding and screw-nose pintongs or pinvices have a small loose or fixed split chuck at the end of a hollow handle through which wire can be passed and gripped true in the centre of the tool. The chuck is closed either by a ring which slides on the tapered body of the chuck, or by a knurled nut which has part of its hole tapered and screws over the chuck jaws. The tool is made in a range of sizes, either for hand use or for fitting into the jaws of a large machine chuck. When made with a back centre point it can be fitted with a ferrule, driven by a bow and used for turning.