ALVIN® Telescoping Tube – 23⁄4" Interior Diameter

These telescoping tubes adjust in length from 18½" to 43" with a 2¾" inside diameter. Twist-lock adjusts for desired lengths. Made of durable black plastic, tube is water-resistant and ideal for drawings, maps, posters, and more. Features twist-off screw cap with a window for viewing contents inside tube, identification label to mark its contents, adjustable shoulder strap, and assorted cap colors.