13 Rock Drilling T ools 800 8726899 Brunner Lay Part Number Inserts Holes Inches MM Pounds Kilos Gauge Mid Face To p Side Standar d 4P oint 158 41 T161 1M0 11 50 134 45 T171 1M0 12 54 178 48 T191 1M0 15 68 2 51 T201 1M0 17 77 214 57 T221 1M0 18 90 Button Bits Modifed Chisel 112 38 S151 1M 11 50 59mm 214 1316 214 158 41 S161 1M 13 59 59mm 2516 114 114 134 45 S171 1M 15 68 538 238 1732 1516 178 48 S191 1M 17 77 5716 238 114 17mm 2 51 S201 1M 20 91 5716 2716 1316 2516 Crown 3 76 S301 1CA 27 12 612 3716 338 3516 114 Diameter W eight Button Bits are available with Standard Parabolic Ballistic or Conical Carbide Parabolic P as the last digit Ballistic B as the last digit Conical C as the last digit 112 R ope 118 R28