Bison 3 Phase, Electric Chain Hoist with Motorized Trolley, 20 Ft. 230v/460v (1 - 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, Trolley Speed: 48 Ft Min, Complies with ASME B30. 16 1 Ton Lifting Speed: 23 Ft Min, Headroom: 18. 1 inches 2 Ton Lifting Speed: 14. 4 Ft Min, Headroom: 22 inches 3 Ton Lifting Speed: 17. 7 Ft Min, Headroom: 26 inches 5 Ton Lifting Speed: 9. 2 Ft Min, Headroom: 37 inches