Two flute straight cutters produce a cleaner finish than the single flute cutters & are suitable for grooving rebating mortising & drilling. Use Tungsten Carbide tooling when working with abrasive materials such as chipboard MDF plywood & certain hardwoods. T.C.T. Tooling 1/2 in Shank. C = 63 mm. D = 15.9 mm. 5/8 in.