Aardwolf ASL Scissor Lifters are designed to lift stone slabs, barriers, kerbs, walls and tombstones, with the aid of an overhead lifting device. Simply position the lifter over the object to be lifted, lower and then raise, and the gravity-operated locking latch will automatically grip the object. Grip range begins at 0" to 4" for the smallest model, up to 12" to 18" for the largest. Release is fully automatic when the stone comes to rest completely on the ground. Aardwolf ASL scissor lifting clamps are equipped with long-lasting polyurethane gripping pads, and have a rubber-lined bar to prevent damage to the material.