the drawings however the flexibility of the drive 6 and the extent to which the vibrator by virtue of its size and weight are such that the hand held vibrator can be both oriented and driven in any desired direction making it possible to engage and vibrate reinforcing rods which protrude in any direction out of a bed or swath of poured concrete operation of the above described vibrator will now be described more particularly with reference to fig1 and 12 of the drawings the need to settle poured concrete and the utilization of reinforcing bars has been described in the opening paragraphs of this specification and fig1 and 12 show two alternative constructions with reinforcing bars extending upwardly and outwardly of a bed of poured concrete in fig1 a plurality of blocks 24 are stacked with each block having a cell or channel 25 extending therethrough with the channels of superposed blocks in alignment concrete 26 is poured into the channels and reinforcing rods or bars 27 extend downwardly through the channels of the superposed blocks and are embedded in the poured concrete the vibrator of the invention is used to vibrate the reinforcing bars to agitate the poured concrete in order to remove air therefore and enable the concrete.