Seco 6 in Aluminum Extension – 1" OD The Seco 5132-00-ACL is a compact aluminum pole extension designed for fine height adjustments in GNSS and surveying pole setups. It features 5/8" x 11 male and female threading , allowing multiple sections to be securely stacked for customized pole configurations in the field. Key Features • Aluminum construction for lightweight durability • 6 in (15.2 cm) extension length • 1" (25 mm) outside diameter • 5/8" x 11 male/female threaded ends for stacking • Designed for precise GNSS pole height adjustment