20pcs assorted carbide burrs are preferred for accurate metal removal when shaping， leveling， or porting cast iron， steel， and other nonmetal materials. These carbide burrs come with approx. 3mm head diameter and 3mm shank.Features:100% brand new and high qualityFor DIY enthusiast or hobby and craft fan，give your rotary tool more functionalitySuitable for deburring and polishing metal / nonmetal materials up to HRC70 hardnessWorks with mostly small rotary tools for DIY carving fansSafe， reliable and convenient to useSpecification:- Material: Tungsten steel Solid Carbide- Shape: Cylindrical， ball， conical， pointed tree， inverted cone， round tree， oval， flame， etc- Burr Head Diameter: Approx. 3mm- Shank Diameter: Approx. 3 mm- Quantity: 20pcs Package: 20x Rotary Burr