... softShale, Marl, Sandstone, Soft Limestone etc.395.2~174.63 3/4-6 7/8245-49080-40187.3~311.17 3 ... Shale, Limestone, Medium/Hard Sandstone etc.495.2~174.63 3/4-6 7/8294-53980-60187.3~241.37 ... Dolomite, Limestone, Hard Sandy, Rock etc.595.2~174.63 3/4-6 7/8294-53980-60187.3~241.37 3 ... hardQuartzite, Chert, Basalt Granites, Pyrites etc.795.2-174.63 3/4-6 7/8294-53980-40Contact information TCI Bit 165 ...