drill bits,button bits-eleven degree,rock drill bit,drill bits,rock bits,sandvik,atlas ... bits and taper cross bits.1. Bit Type: button bits-eleven degree2. Diameter : 28mm – 45mm3. Taper: 7 degree, 11 degree, 12 ... 7A4 6A6)D45b6A6-7227°(6° 11° 12°)45506A6 button bits-eleven degree