Genuine Trend 33/20X1/4TC Two Flute 6.3mm Diameter X 16mm 257019 Use TCT for abrasive materials such as chipboard, MDF, plywood, hardwoods and hard plastics. Two flutes give a clean finish to cut edges. All cutters above and including 9.5mm diameter, have TCT plunge centre tips. Dimensions: D=1/4 inch D=6.3 mm C=16 mm OL=47 mm Shank Diameter=1/4 inch Shank Diameter: 1/4 Grade: TCT Diameter Imperial: 1/4 Diameter Metric: 6.3 Cut Length Metric: 16 Overall Length Metric: 47 Please send all questions via the 'Ask a Question' link on the item listing, or our full contact details can be found in the Business Seller Information just below this box.