Features and Benefits:11,000 RPM;1 HP Motor eliminates "stall" and increases reliability;Spindle lock for easy wheel change;Speed control switch located at the top of the grip for added control;Multi positional rotational guard improves access;The composite grip and throttle trigger have been ergonomically designed to provide unmatched comfort for the user;360? Rotational exhaust;The AIRCAT 6340-A is a 4.5" Angle Grinder with a powerful 1 HP motor making it the strongest in it's class of grinders. The slope of the head allows the 6340-A to reach areas where other grinders can't and it features a spindle lock for easy change of grinding accessories. The 6340-A features a composite grip, not metal for user comfort. The guard is multi positional for better access and visability of the work area. The 360 degree rotational rear exhaust keeps debris away from the user and work area. 2 Year Warranty. 5/8"-11 Spindle. Uses 6 CFM (Ave) using a 3/8" hose with 1/4" fitting.