central bore 26 the lead cutter 18 and trailing cutters 30 may be positioned such that they slightly overlap one another progressively inward along arc or flute 16 in such manner the cutters 14 18 in each arc or flute 16 cut the same area alternatively the cutters 14 18 can be positioned such that there is a gap in the cutting path between cutting edges 29 31 in this manner each arc or flute 16 would cut a rake like pattern into the surface being cut thus creating a series of arcuate grooves and ridges the cutters 14 18 of the second arc or flute 16 would be positioned such that their cutting edges 29 31 would cut the ridges of material left by the first arc or flute 16 of cutters 14 18 drill bit 10 is provided with a series of radial bores 32 drilled radially inward from the cylindrical surface of drill bit 10 in close proximity to the face 22 of drill bit 10 these bores 32 provide residence for locking pins 34 there is one bore 32 and locking pin 34 corresponding to each cuttter 14 18 each of the bores 32 intersects a corresponding bore 12 20 perpendicularly thus with the exception of the bores 32 corresponding to lead cutter s 18 and its bore s 20 all bores 32 are directed substantially perpendicular to the central axis of the drill bit 10 at the base of each cutter 14 18 there is a v notch 36 the interaction between each v notch 36 and its corresponding locking pin 34 prevents rotational movement of the cutters 14 18 and allows cutting faces 28 30 to be fixed in the desired positions thus setting.