Fendergrip will help you set up, adjust and use your fenders more effectively. The push-button feature of the fendergrip provides fender height adjustment in seconds with a positive lock to hold the line in place. (will hold up to 845 lbs with 1/2" braided line.) At home on any boat from a 13' boston whaler, to a 27' sea ray, to million dollar yachts and megayachts. Also used by the usa. Coast guard and marine police agencies.