The Induro MGC45 Geared Center Column is made specifically for the CT404 and CT505 Grand series tripods. It has a reversible 1/4"-20 and 3/8"-16 threaded stud on both ends for mounting two cameras simultaneously or for quickly changing your camera's location without removing the arm. The arm adds 2" to the tripod's height when it is at its lowest position, and 14" when it is at its highest. A twist lock prevents the column from slipping down.