High Speed Steel Jewelers' Setting Burs 0.90-2.90mm 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. Sizes 1-11; diameters 0.90-2.90mm. Supplied individually.