Peak Adjustable Jack Posts are ideal for supporting structural beams when installed according to local codes. Engineered to provide support for extra floor loads including appliances, water beds, pianos and so much more. Perfect for PRO builders, our adjustable support columns are great for new construction as well as temporary or permanent renovations and repairs. Our jack posts feature large holes on the mounting plate for flexibility when aligning. They are each fitted with a heavy-duty adjustment screw and two locking pins for added strength and ease of adjustability. Constructed from heavy-gauge, corrosion-resistant steel for strength and durability (11-gauge inner tube; 12-gauge outer tube).