The Seco 8.5-Foot CL Aluminum Prism Pole 5600-10 is an alternating red and white prism pole with one adjustable section that extends to 8.53' and collapses to 4.97'. Surveying professionals will enjoy this prism pole's highly effective compression lock which grasps the section and holds it in place at your desired length. This prism pole also features dual graduations in feet, tenths, and hundredths of a foot and centimeters. It has a 5/8 x 11 mounting thread on top and an adjustable tip at the bottom. Constructed of aluminum, this prism pole promises you durable, wear-resistant performance for the long-term.