CMS Speed-Connect Adjustable Extension Columns can be used with any 1 1/2-inch NPT accessory to lower projector to desired height. Provides up to 2' range of height adjustment in 1-inch increments depending on model (6-inch to 12' lengths). Includes set screw for added rigidity. Product Type: Mounting component Mounting Components: Extension column Adjustable Height: 61-91.4 cm Max Load Weight: 412 lbs Material: Aluminum Color: Black Adjustable Height: 61-91.4 cm Material: Aluminum Color: Black Type: Mounting component Mounting Components: Extension column Max Load Weight: 412 lbs