MAX Series air angle grinder the 3445MAX is the ideal choice for high-performance material removal. This 4-1/2 in air angle grinder combines a unique internal governor with a powerful 0.88 hp motor, to give you a best-in-class power to weight ratio grinder that will maximize your rate of material removal.0.88 hp and 12,000 rpm motor delivers the power you need to grind through the toughest jobsInternal governor maximizes speed under load, thus increasing your rate of material removalLower weight (less than 3.5 lb) and enhanced grip design enables extended usage without fatigueBuilt-in lubricating wick optimizes the life of the angle gear set by improving lubrication to the bevel and pinion gear set