The Sokkia 8.5-Foot Pro Series Aluminum Prism Pole 808200 offers surveying professionals alternating red and white markings with dual graduations in hundredths of a foot and centimeters. At the bottom of the pole is an adjustable, stainless steel tip and at the top is 5/8 x 11-inch mounting thread. This prism pole's one aluminum section is wear-resistant, extends to 8.5 feet, and collapses to 4.9 feet. Its soft, rubber knob easily loosens to adjust your length and locks to secure your desired length. Attached to this 1.25-inch diameter prism pole you will also find a level vial with 40-minute sensitivity.