Maxipress F Piston Clamp, 20 in Opening, 5 in Throat Depth, 9,000 NRolled spring steel bar provides maximum pressure held throughout the whole job Fixed jaw surface is grooved to achieve maximum grip Spring activated back brake keeps moving jaw firmly in position Covered double threaded screw doubles both pressure and speed with a greasing hole for optimum lubrication Dismountable, interchangeable easy grip handle