Using these Abaco two - handed carrying clamps is easy. First, ensure the rubber pads are clean and in good condition. Then, place the clamps on the edges of the stone slab. The weight of the slab will automatically create the clamping force. To move larger slabs, simply use multiple pairs of clamps. When using, always check that the clamps are securely attached to avoid the slab slipping. After each use, clean the rubber pads with a mild detergent and dry them. Store the clamps in a dry place to prevent rust and damage to the rubber pads. Do not exceed the recommended weight limit of the clamps to ensure safe operation.