CRANETECHÂ make spring operated cable reeling drums supply power to machines such as cranes & hoists and are suitable for both A.C & D.C applications. These drums winds & unwind cable on the drum and are used in horizontal and vertical operations. i.e: Cranes, Lifting Magnets etc. The springs used in these drums are of high quality spring steel material. The power sliprings are designed for 600V,