Labyrinth construction that seals motor and bearings from contamination. A Zig-Zag varnish on armature and powder coating on field to protect motor from abrasion. Engineered for durability with double protection against dust. High quality motor and machined gears. Ergonomic soft grip for vibration absorption and comfortable operation. Slim housing design for easy handling and maneuverability. Thumb switch conveniently located for operator comfort. Includes: 4 1/2" Depressed centre wheel, lock nut wrench, lock nut, inner flange, wheel cover assembly, side handle and plastic carrying case. 1-year limited warranty.