HERTRON INTERNATIONAL, LLC; Hertron International offers cutting edge products for Natural Stone Restoration, Cleaning, Sealing, and Maintaining. Our Prime Grind System is for Natural Stone marble, travertine, limestone, slate, granite, Terrazzo, & Concrete. Our products include Cleaners, Densifiers, Hardening Agents, Stone Polishes, Sealers & Specialty Honing diamonds & Polishing Pads for Stone. Our products, Building Materials, Natural Stone, Cutting Wheels, Power Tools ...