Lightnin Air Powered Mixer. Model: NAG100. S/N: 7318738. Lightnin air-driven mixers are safe for use in flammable or explosive environments. No heat build-up. Motor operates spark free. Speeds can be varied by means of the air control valve. Motor designed to handle stalling overloads without burning out. Lightweight makes for easy handling. Gear driven for maximum output torque. Positive chuck max. propeller shaft diameter: 7/8 in. Shaft length: 30 in. Propeller diameter: 6-1/2 in. Overall dimensions: 15 in. L x 7 in. W x 46 in. H.