A support device is provided including first and second telescopic members (4,6), the distal end or ends of the members engaging with a suitable surface in use. Locking means (20) are provided on the first and/or second members to lock the members in a required relative position. The locking means includes a locking portion (26) movably mounted on the first and/or second members and actuating means. The actuating means move the locking portion between a first unlocked position, wherein the locking portion (26) is movable relative to the first and/or second members, and a second locked position, wherein the locking portion (26) engages with the first and/or second members to lock the members in the required relative position.