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 = 37 mm. D = 25.4 mm. 1 in OL = 66 mm.