Enhance your fishing experience with the Stratum Outdoors pole collar. The Stratum Outdoors pole collar offers a secure and useful way to connect your mounts to your transducer pole. Featuring Stratum's ThruBolt technology, this collar allows for smooth 360-degree movement, giving you precise control over your transducer's direction for effortless and stable rotation. Whether used on ice or water, the durable design ensures consistent performance, letting you track fish movements with ease. 1.22" (31mm) opening.