The present invention is directed to a shieldable blood collection set (10) as well as a needle assembly (12) for use therein. The needle assembly (12) includes a needle cannula (20) having a puncture tip (28) at a distal end (24) thereof; a hub (30) which supports the needle cannula (20); and a shield (50) axially movable between a non-shielding position, in which the puncture tip (28) of the needle cannula (20) is exposed from the shield (50), and a shielding position in which the shield (50) covers the puncture tip (28). A pair of extendable members (70,72) interconnects the hub (30) and the shield (50). The pair of extendable members (70,72) are moveable between a mating position forming a unitary structure; a lateral position forming a pair of wings extending from opposing sides of the needle assembly (12); and an extended position causing the shield (50) to move from the non-shielding position to the shielding position.