One step instead of two so 50% faster!  Busch® Pavé Burs (Fig 447) are made of tungsten vanadium steel for strength and durability and are a unique (patent-pending) combination of a twist drill and a round bur. This game changing bur allows the need for only one tool/bur for pre-drilling, shaping and enlarging!  These burs are perfectly shaped to prepare your jewelry for pavé setting while making a clean cross cut to create the desired notches for the stones.  Comes in Set of 9, one each of sizes 008 – 016 as well as a sold individually in Packs of 6.  Recommended speed is 5,000-10,000rpm. 3/32" (2.38mm) shank.  Engineered with precision in Germany.