Description: 【Shock Absorbing Lock System】: Ideal for hiking enthusiasts and outdoor adventurers, this quality trekking pole fitting features an internal shock absorption mechanism that reduces impact from rocky terrain. No more uncomfortable vibrations or jarring impacts when crossing difficult trails and uneven surfaces 【Internal Expansion Mechanism】: Utilizes a great locking system. The yellow expansion device moves left and right, the yellow body contracts inward, and the blue body contracts, expanding the yellow to lock the pole 【16mm Tube Compatibility】: Designed for standard 16 mm / 0.63 inch trekking pole tubes with great fitment and reliable performance. Ideal for most hiking poles, no more incompatible fittings or loose connections that require constant adjustment on the trail 【Easy Adjustment Design】: Allows quick length adjustments with simple twisting action that locks securely in any position. Ideal for changing terrain, no more complicated mechanisms or tools needed for on the go pole length changes 【Sturdy Construction】: Made from sturdy materials that withstand trail abuse and maintain reliable performance in all weather conditions. No more worrying about component failure or degraded performance during extended outdoor use Specification: Material: Plastic Size Chart: 1.6cm/0.63inch Package Includes: 1 Trekking Pole Expansion Tube Note: Please allow slightly errors 1-2cm/0.39-0.79inch differences due to manual measurement.