Cable management access provided at one end of column Lightweight aluminum construction for ease of installation and lower freight cost EXT model extension column lengths measure 1(25mm) longer than stated drop to provide finished drop length for various mounts 1-1/211.5 NPT threaded on both ends. Notched for use with screw to provide safety and security. Fixed length extension EXT model columns are constructed of 11/211.5 NPT schedule 40 pipe threaded and notched on both ends for safety locking. Features Product colour Black Weight & dimensions Weight 2.72 kg Logistics data Harmonized System (HS) code 85299018