Trend 3/4 x 1/2 TCT Two Flute Cutter 8.0mm x 19mm TRE3412TC Two flute straight cutters produce a cleaner finish than the single flute cutters and are suitable for grooving, rebating, mortising and drilling.Use Tungsten Carbide tooling when working with abrasive materials such as chipboard, MDF, plywood and certain hardwoods.T.C.T. Tooling ½in Shank.T.C.T. Tooling ½in Shank. C = 19 mm D = 8 mm 5/16 in TRE3412TC