Bison 3 Phase, 2-Speed Electric Chain Hoist with Motorized Trolley, 20 Ft, 230v/460v (1/2 - 5 Ton)20 Ft. Lift Height, Chain Container Included, 17 Ft. Pendent, 208 230V 3 Phase or 460V 3 Phase, Swivel Bottom Hook, Single Chain Fall, Complies with ASME B30. 16 1 2 Ton Lifting Speed: 10 31 Ft Min, Headroom: 18. 1 inches, Trolley Speed: 44 15 Ft Min 1 Ton Lifting Speed: 23. 6 7. 9 Ft Min, Headroom: 18. 1 inches, Trolley Speed: 90 32 Ft Min 2 Ton Lifting Speed: 14. 4 4. 6 Ft Min, Headroom: 22. 05 inches, Trolley Speed: 90 32 Ft Min 3 Ton Lifting