York: 6.3X12.7MM Cylindical Ball Nose Cabide Bu Dbl CU Cut 6 cylindrical ball nosed rotary burrs feature crosscut and double cut profile to improve control and chipbreaks. Manufactured from high grade tungsten carbide for general-purpose use. Suitable for deburring and polishing of cast iron, cast steel, carbon steel, alloy steel and stainless steel, up to HRC65 hardness. Features and Benefits Tungsten carbide construction for improved hardness and strength Crosscut and double cut profile to improve and control chipbreaks Typical Applications Deburring Steel Cast iron Please note: Work piece 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 and high revolutions '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.