Electric Chain Hoist Duty Classification H4 Mount Type Hook Mounted - No Trolley Maximum Lifting Capacity 551 lb Number of Speeds 2 Programmable Non-Programmable Fixed Lift Speed 7.9 fpm 31.5 fpm Trolley Speed Not Applicable Maximum Lifting Length 9 ft Current at Minimum Voltage 1 A Current at Maximum Voltage 1 A Motor Horsepower 5/8 hp Operating Voltage 575V AC Headroom 27 3/8 in For Minimum Beam Height Not Applicable For Maximum Beam Height Not Applicable