Drill bit system, assembly, and method for forming holes in materials

A drill bit assembly, the drill bit assembly comprising:

• a shank, the shank having a bit-engaging end, the bit-engaging end having a shank tip, a notched portion adjacent the shank tip, and a shank length extending from the notched portion, the shank tip and shank length having a substantially uniform shank diameter, the notched portion having a substantially uniform notch width;
• a primary drill bit, the primary dill bit having a primary shank-engaging end and a primary bit axis, the primary shank-engaging end comprising an outer bit surface, an inner female structure for receiving the bit-engaging end, and a bit aperture, the bit aperture extending from the outer bit surface to the inner female structure orthogonally relative to the bit axis, the female structure having a substantially uniform inner bit diameter sized for receiving the shaft diameter;
• and
• fastening means for removably fastening the primary drill bit to the shank via the notch, the notch width being sized for receiving said fastening means, the bit-engaging end being receivable by the primary shank-engaging end, said fastening means being receivable by and cooperable with the bit aperture and the notch for removably fastening the primary drill bit to the shank.

A method for forming holes in a plurality of materials;

• the method comprising the steps of:
• providing a shank with a bit-engaging end, the bit-engaging end having fastener-receiving structure, the fastener-receiving structure having a structural width;
• providing a series of drill bits, each drill bit having a shank-engaging end with inner female structure for receiving the bit-engaging end and an aperture for receiving a fastener;
• inserting a first fastener into a first aperture of a first shank-engaging end of a first drill bit, the first fastener having a maximal outer first fastener diameter;
• inserting the bit-engaging end into the first shank-engaging end thereby joining the first drill bit to the shank;
• extending the first fastener into the fastener-receiving structure of the bit-engaging end such that the maximal outer first fastener diameter is received intermediate the structural width;
• fastening the first drill bit to the shank via fastening engagement of the first fastener against the bit-engaging and first shank-engaging ends;
• and
• drilling through a first material via the first drill bit.