D400-54 hi-lift drums for setups with up to 54 inches of high lift. Those handle a maximum cable size of 5/32" and are rated at 275 lbs per drum, 550 lbs total for the pair. Sold as a left and right pair. The drum geometry is different from standard lift drums because the cable has to travel a longer path on hi-lift configurations. If you are converting to hi-lift or replacing worn hi-lift drums, measure your actual hi-lift distance to make sure 54 inches is the right spec. Cable length formula: floor to shaft center plus 63 inches, minus your specific hi-lift measurement.