An intraosseous needle set operable to be rotatably inserted into a bone and associated bone marrow comprising: a hollow outer penetrator with an inner penetrator slidably disposed therein; the hollow outer penetrator having a first end and a second end; the inner penetrator having a first end and a second end; the first end of the inner penetrator extending from the first end of the outer penetrator; the hollow outer penetrator having an elongated bore extending from a first opening in the first end of the hollow outer penetrator to a second opening in the second end of the hollow outer penetrator ; the first end of the hollow outer penetrator having a plurality of cutting surfaces disposed on exterior portions thereof adjacent to the first opening in the first end of the hollow outer penetrator ; the first end of the inner penetrator having a plurality of tapered cutting surfaces disposed thereon; the plurality of tapered cutting surfaces cooperating with each other to form a tip on the first end of the inner penetrator ; the plurality of tapered cutting surfaces formed proximate to the first end of the hollow outer penetrator when the inner penetrator is fully inserted into the outer penetrator; the plurality of tapered cutting surfaces comprising a first tapered cutting surface extending a first length from the tip on the first end of the inner penetrator ; the plurality of cutting surfaces and the plurality of tapered cutting surfaces configured to cooperate with each other to penetrate the bone and associated bone marrow; characterized in that portions of the first tapered cutting surface is disposed within the first end of the outer penetrator when the inner penetrator is fully inserted into the outer penetrator. a hollow outer penetrator with an inner penetrator slidably disposed therein; the hollow outer penetrator having a first end and a second end; the inner penetrator having a first end and a second end; the first end of the inner penetrator extending from the first end of the outer penetrator; the hollow outer penetrator having an elongated bore extending from a first opening in the first end of the hollow outer penetrator to a second opening in the second end of the hollow outer penetrator ; the first end of the hollow outer penetrator having a plurality of cutting surfaces disposed on exterior portions thereof adjacent to the first opening in the first end of the hollow outer penetrator ; the first end of the inner penetrator having a plurality of tapered cutting surfaces disposed thereon; the plurality of tapered cutting surfaces cooperating with each other to form a tip on the first end of the inner penetrator ; the plurality of tapered cutting surfaces formed proximate to the first end of the hollow outer penetrator when the inner penetrator is fully inserted into the outer penetrator; the plurality of tapered cutting surfaces comprising a first tapered cutting surface extending a first length from the tip on the first end of the inner penetrator ; the plurality of cutting surfaces and the plurality of tapered cutting surfaces configured to cooperate with each other to penetrate the bone and associated bone marrow; characterized in that portions of the first tapered cutting surface is disposed within the first end of the outer penetrator when the inner penetrator is fully inserted into the outer penetrator. <EOS>