The Sokkia 15-Foot Pro Series Aluminum Prism Pole 808202 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 three aluminum sections are wear-resistant, extend to 15 feet, and collapse to 5.16 feet. Its soft, rubber knob locks easily loosen to adjust your length and lock 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.