Use TCT for abrasive materials such as chipboard, MDF, plywood, hardwoods & hard plastics. Two flutes give a clean finish to cut edges. All cutters above & including 9.5 mm. diameter, have TCT plunge centre tips. D=15/32 inch. D=12 mm. C=38 mm. OL=80 mm. Shank Diameter=1/2 inch.