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Chief CMA-009012: Adjustable Extension Columns 9" - 12": Weight Capacity: 500 lbs, CMA Adjustable Extension Columns can be used with any 1 1/2" NPT accessory to lower projector to desired height. Provides 2' range of height adjustment in 1" increments depending on model (3' to 12' lengths). Includes set screw for added rigidity. (CMA 009012 CMA009012 CMA-009012 CMA00901 CMA0090)