Features: Make of high strength ABS Materials, have durability and reliability in most demanding environment. Track Balls base is specifically designs as a track system for kayaks, boats and so on. Small in size and light in weight, it is easy to carry, very convenient to use. The kayak quick release track base is perfectly used to anchoring, fishing rod, storage, lashings and clotheslines. Quick release and easy installation, you can adjust base to or add to the existing trail. Specifications: Materials: ABS Total height: about 7.8cm/3.07inch Package Includes: 1pc Kayak Quick Release Track Base note: Please allow 1-2cm errors due to manual measurement, make surely that you not mind before order. Due to difference between different monitors, the picture may not reflect the actual color.