ZUOS makes professional 90° joint installation faster and easier. It is a jointing machine and seam aligner in one sleek body, producing smooth surfaces with seamless joints. Works with various materials like granite, stone, marble, and glass. Ideal for butt joints, complex, and interior angles. Two 8-inch vacuum cups with hand pumps provide secure holding, and two finely adjustable knobs ensure precise alignment. Allows easy adjustment with a smoothly rotating knurled roller. Built with durable stainless steel components and aluminum clamping handles.