Pearl's Premium Carbide Burs feature precision ground tungsten carbide for aggressive cutting and long working life. Available in a wide range of shapes and sizes and also in double cut or single cut varieties. Pearl Premium Burs are perfect for weld dressing, smoothing castings, shaping holes and more. SA - CYLINDRICAL PLAIN END: Ideal for contour finishing The Aluminum Cut is designed to be used on Non-Ferrous metals and has an open cut for aggressive stock removal and avoids loading of material on softer metals.