Strauss' Magic Touch bur, 878K/021PF is a unique bur that contains a special new grit which allows for fast adjustment on Zirconia or Alumina coping without the risk of micro fractures in the frame, and a very fine finish without scratches. These diamonds are an invaluable tool for work with all types of ceramic crowns and bridges. The 878K/021PF has demonstrated excellent results on Lava, Inceram, Procera ® and Vita ®.