MAX Series Air Angle Grinder The 3445MAX is the perfect choice for high performance material removal. This 4.5" 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. MAX Power - 0.88 hp and 12,000 rpm motor delivers the power you need to grind through the toughest jobs. MAX Productivity - Internal governor maximizes speed under load, thus increasing your rate of material removal. MAX Comfort - Lower weight (less than 3.5 lbs) and enhanced grip design enables extended usage without fatigue. Built-in lubricating wick optimizes the life of the angle gear set by improving lubrication to the bevel and pinion gear set.