Length-adjustable telescopic tube

The telescopic tube has a piercable bolt that enables mutual locking of pipes in desired extended position. A handle lever and a closure element extend from pin axis and are arranged in different planes perpendicularly to the pin axis. A securing portion has an opening for passage of bolt and that opens into a recess through which the closure element is inserted into securing portion in rotational position. The closure element is supported in rotational position of a rotary latch from the anal setting of the bolt on the securing portion. An independent claim is included for a support leg.