SJS Mechanical Clutch System Helps Prevent Motor and Gear Damage Powerful 10.5 AMP motor delivers 11,000 RPM to handle the most demanding applications SJS technology is a mechanical clutch system that helps prevent motor and gear damage by allowing the drive shaft to slip if the wheel is forced to stop Electric brake for maximum productivity "Tool-less" wheel guard for more convenient adjustments Spiral bevel gears for smoother rotations and a more efficient transfer of energy Zig-zag varnish protects the armature coil from dust and debris for longer motor life Labyrinth construction prevents debris from penetrating the motor, bearings and gears for longer tool life Externally accessible brushes for greater serviceability AC/DC switch for use with alternative power source No lock-on feature for more convenience Includes: (1) 5" x 1/4" x 7/8" INOX Grinding Wheel, 36 Grit (A-95962) (1) 5" Tool-less Wheel Guard (135108-2) (1) Inner Flange (224399-1) (1) Lock Nut (193465-4) (1) Lock Nut Wrench (782424-9) (1) Side Handle (153504-2)