Avail ease of adjustment under load with a complete steel made Scaffolding Jack range from Scaffolds Supply. These are made of high strength low alloy structural steel rods and are not hollow in nature. Hence it can withstand heavy weights with ease. While some of the Jacks you find below are hot dip galvanized, the others are zinc plated or electroplated to ensure they last for long. Most importantly, these are highly weather resistant.