The 90 Degree Stone Seam Setter is a professional right angle alignment tool designed for countertop installation, ideal for granite, marble, quartz, and tile surfaces. Its precise 90° right angle design ensures consistent and seamless stone joint alignment, helping you achieve accurate corner positioning with ease. Crafted from a durable stainless steel frame for heavy-duty use, the tool features rubber suction cups that firmly hold stone panels in place during the countertop alignment process, maintaining stability throughout installation. Lightweight at only 0.45 lbs, it is easy to carry to job sites, with a comfortable handle for extended use. Operation is simple and straightforward: the adjustable knob allows easy control of seam tightness, streamlining the countertop installation process. This practical tool combines durability, portability, and ease of use, making it a reliable choice for countertop installation work.