Spreader Beam - Adjustable To 2.1t for Hire in Blacktown and Sydney. Spreader beams are used whenever two or more legs  of a lifting sling arrangement need to be spread  apart. This is usually done for reasons of load  protection or stability. Spreader beams are different  to lifting beams in that they are used with a two  legged sling on top of the beam which goes out to  the ends of the beam (or to a position in line with the  lower slings).