AG discs last longer and provide higher performance than XC or GD discs, and are useful for heavier deburring and finishing applications | Aluminum oxide is durable and the most common abrasive grain | Open web construction resists clogging | Resin bond for heat and moisture resistance, and retaining abrasive grains well | PowerLock Type III discs have threaded central hubs that require two-and-a-half turns and mount to Norton TR or 3M Roloc TR back-up pads