The 38mm poker shaft consists of a flexible shaft and a vibrating poker (needle) head with a diameter of 38mm. When connected to a vibrator motor, it produces strong vibrations that penetrate wet concrete, removing air pockets and preventing defects such as honeycombing.
Most models come with a flexible hose shaft of around 4–6 meters, allowing the operator to easily reach deep areas such as foundations, columns, beams, and slabs during concrete casting.