Recommended for switchboard and internal telephone wiring in high rise building, offices, factories, hotels, residential complexes, transmission of analog and digital signals, internal wiring in faxes, modems, alarm enunciators, data recording...
 The optimum range of hole size for blast hole drilling with DTH is 90 mm to 254 mm (3 1/2'-10'). Smaller blast holes are generally drilled using tophammer, and larger holes generally use rotary machines....