The Abaco Self- Locking Dollies are made with the heavy duty use purposes. The rubber is vulcanized to the bottom and sides of the dolly to avoid chipping the edges of finished work pieces. They are designed with self-locking jaws for maneuvering stone slabs around the shop, warehouse, or work site. The self- locking jaws clamping strength is proportional to the weight of the slab, therefore the heavier the slab, the larger the clamping force will be.