High Speed Steel Jewelers' Wheel Burs These hand-cut, high speed steel burs last longer than standard jeweler's burs. They offer exceptional cutting efficiency and are available in a wide variety of shapes and sizes for cutting most metals. All have 3/32" (2.4mm) shanks and will fit most flexible shaft handpieces. Varying sizes from 5-34; diameters from 1.70mm to 11.10mm. Supplied individually.