Designed for hazardous environments, Yale® Global King™ and Shaw-Box® World Series™ are available with variable frequency drives for optimized speed adjustment and load control. Explosion-proof features, spark-resistant options, and additional corrosion resistance are also available. While 60 ft monorail or top-running lifts offer capacities to 15 tons and lifting speeds of 20/5 fpm, 80 ft lift monorail units offer capacities to 7½ tons and lifting speeds of 40/10 fpm.