General English

Cars & Driving

  • noun a special tool for use with an electric drill or air tools to smooth and polish engine, clutch or brake cylinders, with a number of honing stones that adjust to different cylinder bore diameters by spring tension


  • A smooth, fine-grained stone against which a tool's cutting edge is worked to achieve a finish edge much sharper than that yielded by the coarser stone used in preliminary sharpening procedures. Usually an oil is used in the process to carry off minute particles of loose stone and metal to prevent them from clogging the pores on the stone's surface.