Bosch 5 inches 125mm Intermediate Sanding Pad for GEX 125-1AE Orbital Eccentric Sander Bosch AccThe intermediate disc for random orbit sanders extends the life of the backing pad considerably. As a strong protective layer with Velcro fastener, it optimizes the adhesion between the grinding wheel and the backing pad, especially under heavy loads and when working with heavy loads. The intermediate disc is perfect for mesh grinding discs on random orbit sanders. Diameter: 125mm