For sheet size: 5″ L x 2-3/4″ W. Makes sanding faster, easier, and more effective for auto body repair and other jobs. Rubber block conforms to sanding surfaces, keeping sandpaper flat against the surface. Helps ensure consistent sanding results without “sanding waves”. Sized and shaped for comfort and control. Internal attachment pins hold sandpaper securely in place. Suitable for various materials like metal, drywall, wood, plastic, and fiberglass.