Feature:1. [Universal Fit] This pole clamp is designed to accommodate poles with diameters of 32mm or 20mm, ensuring compatibility with a wide range of surveying equipment.2. [Anodized Aluminum] Constructed from anodized aluminum, this pole clamp offers excellent stability and durability in the field, providing stable support.3. [Quick Release Mount] This clamp holder is compatible with the most popular quick release mount, allowing for easy installation and removal.4. [Practical Tool] Specifically designed for RTK measurements that require a pole and a data collector, this pole clamp is an ideal solution, offering secure mounting for your equipment during surveying tasks.5. [With Compass] Equipped with a compass, this pole clamp provides added functionality, allowing for easy orientation and direction finding while you conduct your RTK surveys.Specification:Item Type: Data Collector Phone HolderMaterial: Aluminum Alloy.Package List:1 x Compass Part1 x Phone Holder Part2 x Pad