Diamond borax impregnated crowns bits of 33И3Г, 34И3Г
the borax impregnated crowns of 33И3Г, 34И3Г - BQ, NQ, HQ, intended for boring with the detachable core-collectors (SSK) on the standards of the USA in the species IX-XI of category on 12 scale-number scale of resistance to drilling
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