Laser 6988 Tungsten Carbide Burr Set 4pc Features and Benefits: Tungsten carbide bit set, extended length with 6mm shank. For cutting, shaping, grinding and for the removal of sharp edges. Contents Tree shaped 12mm cut diameter (25mm cut length) x 152mm shank length. Tree shaped 10mm cut diameter (20mm cut length) x 154mm shank length. Ball shaped 10mm cut diameter (9mm cut length) x 150mm shank length. Ball shaped 10mm cut diameter (9mm cut length) x 150mm shank length.