The Cradle with Pole Clamp for Topcon FC 5000 Field Controller snugly fits the body of your data collector to a 1.25 in diameter prism pole. Also compatible with Carlson RT3 Data Collector. Made of anodized aluminum and stainless screws, it features a quick release system for lightning fast assembly and disassembly of the cradle. The Topcon FC-5000 cradle also safely attaches to the handheld computer and does not overtighten, reducing the probability of damaging the device.