Load-adjustable breakable safety device

A load adjustable breakable device comprising a body having a plurality of securing sections to be engaged by securing means and a plurality of zones of weakness of lesser breaking strength than said securing sections for breaking when a predetermined force is exerted thereacross wherein the body comprises at least three apertured securing sections divided by and spaced from intermediate zones of weakness, and wherein the zones of weakness have successively decreasing breaking strengths in downstream adjacent zones of weakness separated by said spaced, apertured securing sections wherein independent securing means are adapted to engage the securing section adjacent the zone of weakness corresponding to a desired load capacity on the downstream side thereof and any securing section on the upstream side of the zone of weakness corresponding to the desired load capacity.