Remain rock steady: Vibration-control side paddle reduces tool-to-hand force transfer by up to 60%. Directed airflow design and epoxy-coated field windings minimize dust- and debris-related maintenance issues. ServiceMinder™ brushes automatically lock the wheel when preventive maintenance is required. Ultra-reliable, fully sealed lock-on switch ensures impeccable response and stress-free operation. Protective guard adjusts easily, without requiring special tools. Spindle lock simplifies wheel changes. Type: Angle; Wheel Diameter: 4 1/2"; Speed: 11,000 rpm.