Constructed of anodized aluminum, this extension tube allows users to gain height in various applications. This tube also gives users the ability to add multiple joiners by utilizing a sleeve mount (Item No. 17467) and joiner system to mount several devices in one location. Features Extends your mount 12″ (150mm) for better positioning Both ends are threaded with M20 threads Threads allow for either a joiner or male threaded adapter Note: Extensions should be used on base end of mount, not device end as the later would reduce the payload of the joiner