Mission DREADKNOT Dock LineThe MISSION DREADKNOT Dock Line features a patent-pending Slide-Lock that automatically grips under load, making docking easier, faster, and more secure. It's built on a proven tension-based design-trusted by climbers and rescue teams for decades. To release, simply twist the capsule to unload tension and slide it free.Why Wholesale Marine loves it? DREADKNOT is a must have especially for new boaters. Simply loop one end of dock line to boat other to cleat on dock then slide to adjust length. Works great as dock line for bow, stern or spring line. No more tie and not happy then re tie. Recommended for boats under 30ft in length. What is a Spring line? Spring line is from center of the boat to front or rear. This keeps the boat from shifting once tied correctly. Features Adjustable Dock Line with two loops on both sides. ; Slide-lock Design; Double Braid line is long lasting. Wont unravel after a few uses. ; Colors Available Black; Grey; SizeDREADKNOT 3/8" DIAMETER: 3/8"; LENGTH: 15-FT; EYELETS: 12"; DREADKNOT 1/2" DIAMETER: 1/2"; LENGTH: 25-FT; EYELETS: 12";