Suitable for a wide range of applications such as engraving, grooving, rebating and shallow mortising. Use on softwoods, hardwoods, MDF, plywood and chipboard. All cutters have a bottom cut feature. .......................D=1/2 inch|D=12.7 mm|C=3/4 inch|C=19.1 mm|Shank Diameter=1/4 inch