An intraosseous device comprising:- a handle (5, 7); a hub which is releasably mounted to the handle; a stylet having an end mounted to the handle; and a cannula having an end mounted to the hub, the handle end of the stylet having a bend and the handle having a receiver for the bent portion of the stylet for non-rotatably fixing the stylet to the handle; the hub end of the cannula having an outwardly extending flare for non-rotatably fixing the cannula to the hub; the handle and the hub having interengagable formations (41, 42) for torque transmission to the stylet and the cannula for bone penetration on either clockwise or anticlockwise rotation of the device, the formations (41, 42) comprising a plurality of circumferentially spaced-apart handle formations that are engagable with a plurality of corresponding formations of the hub, the plurality of hub formations comprising formations of differing shapes and the plurality of handle formations comprising formations of differing shapes wherein, in the engaged configuration, handle formations of the same shape as formations of the hub are aligned, the handle being rotatable relative to the hub from a disengaged configuration in which the handle formations are not aligned with the hub formations to an aligned configuration in which the handle formations are aligned with the hub formations, wherein, in the aligned configuration, the handle is movable axially for interlocking the handle formations with the hub formations, and wherein, in the interlocked configuration, a tip of the stylet extends from a distal end of the cannula and a bevelled edge of the stylet is aligned with a bevelled edge of the cannula. a handle (5, 7); a hub which is releasably mounted to the handle; a stylet having an end mounted to the handle; and a cannula having an end mounted to the hub, the handle end of the stylet having a bend and the handle having a receiver for the bent portion of the stylet for non-rotatably fixing the stylet to the handle; the hub end of the cannula having an outwardly extending flare for non-rotatably fixing the cannula to the hub; the handle and the hub having interengagable formations (41, 42) for torque transmission to the stylet and the cannula for bone penetration on either clockwise or anticlockwise rotation of the device, the formations (41, 42) comprising a plurality of circumferentially spaced-apart handle formations that are engagable with a plurality of corresponding formations of the hub, the plurality of hub formations comprising formations of differing shapes and the plurality of handle formations comprising formations of differing shapes wherein, in the engaged configuration, handle formations of the same shape as formations of the hub are aligned, the handle being rotatable relative to the hub from a disengaged configuration in which the handle formations are not aligned with the hub formations to an aligned configuration in which the handle formations are aligned with the hub formations, wherein, in the aligned configuration, the handle is movable axially for interlocking the handle formations with the hub formations, and wherein, in the interlocked configuration, a tip of the stylet extends from a distal end of the cannula and a bevelled edge of the stylet is aligned with a bevelled edge of the cannula.