The GRABO Stone Seam Setters, the ultimate solution for achieving straight joins on both porous and non-porous surfaces. Designed for professional use, these seam setters elevate your craftsmanship and deliver flawless results.  Equipped with two finely-tuned adjustable knobs, the GRABO Stone Seam Setters allow for precise leveling, ensuring a seamless alignment between surfaces. Additionally, a dedicated adjustable knob is included for seamless joining or opening of seams, giving you complete control over the final outcome.