6-9″ Adjustable Extension Column Save installation time and maximize security with these adjustable columns. Features – Provides height adjustment in 1″ increments – Notched design for adjustment without disassembly – Includes set screw for add stability – Consists of 1.5″ NPT column, threaded on both ends – Use in combination with any Chief 1.5″ NPT ceiling plate or other accessory Certifications: TUV Approved, UL Approved, UL Listed Overall Dimensions (H x W x D): 9.0″ x 2.3″ x 2.3″ (229 x 59 x 59 mm) Weight Capacity: 500 lbs (226.8 kg)