A quality line or chain is must-have equipment in the arsenal of every boat owner. Whether you're going to use it for a specific application or for general purposes, it is a great investment that will come in handy time and again. Depending on the type of the marine line or chain you use, it may help you secure your boat to a dock, or to another boat when rafting, etc. It can also be useful when you need to secure your luggage in inclement weather to prevent it from damage. All these and many more are just few of the marine lines and chains applications, as they may serve a lot of other purposes, 10" L Dock Line Spring for 1/2" D Lines by Perko. Specially designed for a marine application, this product is developed and manufactured with boat owners in mind.