The Battery Joint Setter is designed to close gaps between two pieces of slabs and pull them together. This device works well on stone and glass with non-porous surfaces. It can be quickly closed or opened by simply moving the roller nut with the palm of your hand. The two vacuum bases are aligned with precision steel guide axles. These axles are anchored on each side with the main axle and two sub axles. When the roller rotates, one vacuum base will move along two sub axles and pull two pieces of slabs together. One balance bar with two leveling knobs allows surfaces to be leveled precisely. With the battery-operated vacuum pump, an equal vacuum is maintained in both pads during the working process.