Paske wòch isharderthan asye ki se poukisa li pa kapab reallybedrilledwithout dyaman oswa carbure enpreye en.
Zouti machin renmenrillbits yo se file pa fanm k'ap pile wòch pa nan lòt fason alantou. Nowbrick ak othermasonryare brittlesothey ka chip oswa krak fasil.
