Outer dimensions Mainly used in column (slanting) gear wheel, annular gear wheel, inner and outer straight (slanting) tooth gear wheel, straight bevel gear wheel, face gear wheel, spiral bevel gear wheel, shaft gear wheel, turbine wheel, non-round gear wheel, overtone gear wheel, chain wheel and various type of end surface tooth profile with pre and post heated bevel edge processing. May have the effect of improving the gear drive quality and reducing the transmission of noise.