25 Rock Drilling T ools 800 8726899 Brunner Lay T51 2 51MM 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 Diameter W eight Part Number Inserts Holes Inches MM Pounds Kilos Gauge Mid Center To p Side HIDuty XDesign Bits 412 11 5 T4551Z0 136 62 5 127 T5051Z0 154 70 Button Bits Crown 312 89 S3551H0 84 38 212 312 6916 212 238 4 102 S4051H0 105 48 7916 412 312 2916 238 412 11 5 S4551H0 136 62 758 4916 3916 258 5 127 S5051H0 154 70 858 5916 4916 258 Drop Center 312 89 S3551D0 84 38 6916 312 238 312 4 102 S4051D0 105 48 8916 412 1716 4716 412 11 5 S4551D0 136 62 8916 4916 212 312 5 127 S5051D0 154 70 858 4916 2716 4716 512 140 S5551D0 172 78 858 4916 212 2916 Flat Face HIDuty 312 89 S3551F A 84 38 6916 612 212 238 4 102 S4051F A 105 48 8916 612 2916 412 11 5 S4551F A 136 62 8916 6916 258 5 127 S5051F A 154 70 858 7916 258 Flat Face 312 89 S3551F4 105 48 812 6716 212 238 Retrac 312 89 S3551DW 105 48 812 4716 138 4716 4 102 S4051DW 146 66 8916 412 1716 4716 412 11 5 S4551DW 164 74 8916 4916 2716 4716 5 127 S5051DW 182 82 8916 4916 212 412 Drop Center 512 140 S5551DW 200 90 8916 4916 212 412 312 89 S3551FW 105 48 812 6716 212 238 4 102 S4051FW 146 66 812 712 2716 238 412 11 5 S4551FW 164 74 8916 7916 2916 238 Flat Face 5 127 S5051FW 182 82 8916 7916 2916 3516