Works with any lifting device. The Aardwolf Monument Clamp/Lifter (Automatic) is ideal for lifting and setting concrete, stone, and marble building fascia. By means of a gravity controlled locking latch, the clamp automatically grips and releases the materials. It is useful for moving and setting heavy or awkward retaining wall blocks and slabs. The slim profile allows it to set material in tight places. The clamping jaw and the center of gravity are easily and quickly adjustable by means of the locking pins. The jaws of the lifter are lined with vulcanized rubber to ensure a safe and non-marking grip. The clamps are gravity controlled, which open when rested and close when lifted.