A CYLINDER HONE, often simply referred to as a hone, is a device for making the inside of a cylinder smooth and regular. It consists of a central shaft, intended to be inserted into the chuck of a drill, to which are affixed three arms. At the ends of the arms, on pivoting points (usually rivets) there are three flat grindstones, or simply stones. Tension on the arms is supplied by a spring which pushes a round perch over the inner ends of the arms.
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Most hones have a flexible portion as a component of their shaft, to assist in honing evenly.
These are most frequently used in an automotive context, either to smooth the walls of an engine's combustion chambers, or to do the same to the brake master and slave cylinders. Engine cylinder honing is typically done with a much larger and more complicated bench setup which will automatically hone the cylinder to a particular size.