Suitable for a wide range of applications such as engraving, grooving, rebating & shallow mortising. Use on softwoods, hardwoods, MDF, plywood & chipboard. All cutters have a bottom cut feature. D=5/16 inch. D=7.9 mm. Cut length=3/4 inch. Cut length=19.1 mm. Shank Diameter=1/4 inch.