Clamp with compensating arms, suggested to customers who need to handle concrete blocks and building materials. The clamping force, which can be set through hydraulic valve, allows a safe movement of the load. A pressure relief valve, a non-return valve and a regenerative valve are supplied as standard on each model. Min. and Max. openings can be adapted to different needs, as arms dimension and length. Side shifting valve and semi-integral sideshift available on request.