Bison 3 Phase, 2-Speed Electric Chain Hoist , 20 Ft, 230v/460v (1/2 - 5 Ton)Three Phase Hoist 2 Speed Dual Speed Control. A second speed allows for a more controlled pick. Using the controller, the operator can start to lift (or lower) in the slow speed and then switch to the faster speed for efficiency. Dual speed hoists are highly recommended in environments where positioning fragile material. For example: loading CNC Machines, glass lifting, granite lifting etc. Designed and built to last, these hoists are made for heavy