THREE-IN-ONE - One disc performs three operations, saving time and money while reducing disc changes. Alternating abrasive and surface conditioning flaps provide grinding, blending and finishing with one disc.SUPERIOR FINISH - Reduces risk of excessively deep grooves, heat discoloration and rounded corners. Easily provides a consistent, smooth surface finish.LOWER HEAT - GENERATION Prevents discoloration of the workpiece, leading to less finish work needed.