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The upper unit can be eventually mounted onto the lower unit to form a longer single unit pole. The upper unit can be used independently just like the Series 1 pole (adapter included by default). The upper units consists of 3 tubes with diameters of 24mm, 28mm and 32mm. Closed length is 116cm (45.7"). Maximum extended height is 315cm (124" or 10ft 4"). Maximum recommended loading is 2kg (4.4lbs) for all poles at full vertical extension.