1. A ROCK DRILL BIT OF MULTI-WING, CUTAWAY TYPE ADAPTED FOR ATTACHMENT TO ONE END OF AN ELONGATE DRILL ROD, SAID BIT COMPRISING A SHANK PORTION OF SUBSTANTIALLY UNIFORM DIAMETER; A PLURALITY OF V-SHAPED CUTTER WINGS INTEGRAL WITH THE SHANK PORTION AT ONE END THEREOF AND EXTENDING OUTWARDLY BEYOND THE PERIPHERY OF THE SHANK PORTION TO DEFINE A CUTTING FACE FOR THE BIT HAVING A DIAMETER GREATER THAN THE DIAMETER OF THE SHANK PORTION, AT LEAST TWO OF SAID WINGS BEING DIAMETRICALLY OPPOSITE EACH OTHER; MEANS AT THE OPPOSITE END OF THE SHANK PORTION FOR ATTACHING THE BIT TO A DRILL ROD; AND A SET OF TWO DIAMETRICALLY OPPOSITE, LONGITUDINALLY RECTILINEAR, CUTTER RIBS EXTENDING BACKWARDLY FROM SAID TWO DIAMETRICALLY OPPOSITE WINGS INTEGRALLY THEREWITH AND ALONG THE LENGTH OF AND INTEGRAL WITH THE SHANK PORTION, SAID CUTTER RIBS HAVING OPPOSITELY DIRECTED, LATERAL CUTTING FACES WHICH INTERSECT CORRESPONDING LATERAL FACES OF THEIR RESPECTIVE WINGS ABOVE AND IN SPACED RELATION TO SAID CUTTING FACE OF THE BIT, AND SAID CUTTER RIBS BEING TAPERED INWARDLY TOWARD THE SHANK PORTION IN THEIR BACKWARD EXTENSION FROM THEIR RESPECTIVE WINGS AND CANTED INWARDLY OF SAID RESPECTIVE WINGS AND TAPERED INWARDLY OF THE BIT FROM THE INTERSECTIONS OF THEIR CUTTING FACES WITH SAID LATERAL FACES OF THE WINGS, RESPECTIVELY, AND SAID ONE END OF THE SHANK PORTION BEING TAPERED TOWARD SAID CUTTING FACE OF THE BIT, THE SHANK PORTION BEING SUBSTANTIALLY FREE OF LATERAL ENCUMBRANCES EXCEPT FOR SAID CUTTER RIBS.