The Pro-Graad 7” Ribbed Rigid Resin Fiber Backing Pad is a high-performance solution for grinding, sanding, and stripping tasks on metal, wood, and more. Designed for use with resin fiber discs, this 7-inch sanding disc backer pad features a rigid polypropylene body paired with a cast zinc-alloy lock nut, offering durability and reduced weight compared to rubber alternatives. Its lightweight design supports high-RPM use while maintaining excellent strength and stability. Engineered with spiral-raised ribs and integrated airflow holes, the Pro-Graad backing pad maximizes cooling during operation. This advanced design helps prevent overheating, allowing resin fiber discs to last 30%–50% longer—boosting efficiency and reducing replacement costs. The pad includes a 5/8"-11 zinc-alloy locking nut for easy and tight attachment to all standard 7” angle grinders. It holds resin fiber discs firmly in place, preventing slippage and ensuring smooth, reliable performance even in demanding applications. Whether you're tackling coarse grinding, finishing, or aggressive surface prep, this versatile sanding backup pad delivers. It's widely trusted across industries including construction, welding, fabrication, automotive, and shipbuilding. With standard 7” angle grinder compatibility, cooling innovation, and industrial-grade durability, the Pro-Graad 7” backing pad is the ultimate upgrade for professionals and serious DIYers alike. It's built to handle your toughest jobs while extending the life of your sanding discs—making it a must-have attachment for any angle grinder setup. NOTE: This is a hard, rigid backing pad—not flexible. If you need a flexible backer, this is not the right choice. Best suited for use with coarse/medium grades resin fiber discs in grinding and heavy material removal tasks.