Deals with setting out of tooth profiles of milling cutters for gears of standard 20deg pressure angle type. Covers a standard collection of 8 cutters, special collection of 15 cutters (1 to 8 ascending by 1/2 sizes) and 14.5deg pressure angle cutters. Deals with diminution in gear tooth thickness (essential when milled gears are needed to mesh with generated gears), arbor and keyway sizes, marking of cutters, guidance on ordering and metric sizes.