Blue. Are you tired of fighting to tie and untie knots to adjust your fenders? Danik Fender Hook will certainly cure your frustration. With a push of the lever and a slide of the line, you will have your fenders secure and held in place at just the right height. Adjusting your fender line length has never been easier! Features: quick adjustment, non-corrosive material, adaptable from 3/8″ – 5/8″ line, for sport boats, sail boats, fishing boats & yachts.