Durable and Reliable Material: Rail base with 1.5" track ball is made of durable and high-quality nylon material, which provides long-lasting use and prevents damage from harsh environmental conditions. Easy and Secure Installation: With a 1/4"-20 x 1" t-bolt attachment, our product is designed to be quickly and easily inserted into your track system. Once inserted, just tighten and turn the ball, and you can install it quickly. Versatile Ball Size: Our product is suitable for a wide range of electronic devices such as fishfinders, GPS units, and other accessories. Non-Slip Rubber Washer: Track ball comes with a non-slip rubber washer that provides additional stability and prevents any unwanted movement of your mounted device. Designed for kayaks: Rail base is specifically designed as a track system for kayaks, boats and so on. Whether you're a recreational or a professional fisherman, our Track Ball with T-Bolt Attachment is the perfect solution for your electronic mounting needs. Durable and Reliable Material: Rail base with 1.5" track ball is made of durable and high-quality nylon material, which provides long-lasting use and prevents damage from harsh environmental conditions.