Features MAIN FUNCTION: This pole clamp is suitable for GPS and RTK measuring instruments, providing stable clamping and support for convenient on site operation. APPLICABLE RANGE: This adjustable holder is suitable for RTK measurements that require a 1 pole and 1 data collector, suitable for pole with a diameter of 38mm‑20mm. ALUMINUM ALLOY: The data collector clamp is made of excellent aluminum alloy with anodized finish, ensuring good wear resistance and corrosion resistance. WITH COMPASS: This adjustable pole clamp is equipped with a small compass to help quickly lock the orientation angle, so you no longer lose your direction. EASY OPERATION: The GPS pole clamp is compact and lightweight, with flexible and convenient knob adjustment, making it easy for indoor and outdoor use. Specification: Item Type: GPS RTK Pole Clamp Material: Aluminum Alloy Package List: 1 x GPS RTK Pole Clamp 4 x Rubber Pads  Package List 1 x GPS RTK Pole Clamp 2 x Rubber Pads