Jack post

A jack post (screw jack, telepost, adjustable steel column) is a steel post used in the construction trades for temporary support of loads such as ceilings, walls, and concrete formwork, and as shoring in trenches. They are designed to be able to mechanically telescope to about twice the distance between their pre-drilled adjustment holes. Most examples use removable pins for coarse adjustment and a jack screw for fine adjustments, but many variations exist.

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