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. TCT extra long cutter. Designed for hollow honeycomb board worktops. * Use only on professional routers with 80 mm. deep plunge & suitable one piece multi-slit collet to ensure safe cutter retraction into base. C = 50 mm. D = 12.7 mm. 1/2 in. D = 12.7 mm. C = 50 mm.