These cutters are suitable for grooving rebating mortising & drilling. The single flute cutters offer fast free cutting. If you require a cleaner cut please use two flute cutters. The depth of cut on cutters of 2.0 mm. diameter & below should be a maximum of 1.0 mm. per pass. Small diameters in Tungsten Carbide must be handled with care to avoid breakage & very shallow passes must be made. Use Tungsten Carbide tooling when working with abrasive materials such as chipboard MDF plywood & certain hardwoods. Single flute cutters must not be used in eccentric chucks. Shank. 1/4 in. Dimensions: Shank: 1/4 in. Cutting Diameter (D): 1.5 mm. Cutting Length (C): 6.0 mm.