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Steel tooth: for soft and medium strata
Tungsten Carbide inserts bits: For drilling thru Hard formation, softest to the hardest
we have bits of all sizes viz. 2 7/8", 3 7/8", 4 ½", 5" , 6", 9 7/8", 11 ¾", 12 ¼", 13 ¾", 15", 17 ½" etc.