The Mini DA 3 inch Backing Plate is designed to work specifically with 12mm DA Polishers. Additionally, they are perforated to allow air to circulate through the Optimum Foam and Wool Pads and through the polisher. This air movement will keep paint, pad, and polisher cooler which will improve the performance and the results. The lower temperatures will make your polisher and pads last longer and prevent paint from being damaged due to excessive heat and shear.