The 1701 Dual Action 6 Inch Backing Plate is designed for use with Buff and Shine 6 Inch Foam Flat Pads. This backing plate features a 5/16Ó threaded shaft that is compatible with most dual action polishers. The 1701 Dual Action 6 Inch Backing Plate equipped with a 6 inch foam pad is ideal for buffing out large, flat panels.