Pointed Tree. All sizes are nominal. Sizes marked * are 3mm shank, all others are 6mm shank. Cut Numbers: Cut 6 – Double Cut Crosscut and double cut to improve control and chipbreaks. Manufactured from high grade tungsten carbide for general-purpose use. Cut 9 – Chipbreaker Chipbreaker fast stock removal for improved control and reduced chips for use on hard materials, i.e. steel alloy 50RC, 60RC, carbon and cast iron. Suitable for deburring and polishing of cast iron, cast steel, carbon steel, alloy steel and stainless steel etc. up to HRC65 hardness. Please note: Workpiece and tools should always be steady and well supported. Carbide burrs are not suitable for milling large amounts of material, they are for light stock removal at high rpm s LOW FEED – HIGH SPEED . Always ensure that at least 70% of the shank length is clamped by the collet or chuck of the tool being used. Always ensure that the tool is rated to the recommended operating speed of the burr.