4 inch backup pad for angle grinders with a plastic base, providing stability and reliable performance during polishing tasks. Flexible foam construction enables versatile use and helps achieve a smooth finish on a variety of surfaces. Circular design allows seamless attachment to polishing pads, delivering a secure fit for efficient operation. Available in multiple diameters to suit different needs: 4 inch (100 mm), 5 inch (125 mm), and 6 inch (150 mm). Materials: plastic base and foam cushioning for durability and consistent results. Use scenarios: Automotive detailing: apply polish to painted surfaces for a uniform, quality shine. Metal and wood finishing: smooth and polish metals (such as stainless steel or aluminum) or wood surfaces for a refined finish. General detailing and restoration: work on fiberglass, plastic parts, or boat surfaces to achieve a smooth, even polish.