Anchor Shock Heavy Duty Absorber Eliminates anchor drag and prevents stress cracks on your boat; reduces the amount of pull on the anchor rope by over 50% Works to anchor your boat while fishing, anchor your boat at a sandbar, anchor a swim raft, and mooring your boat at the dock Constructed with 1/2" made-in-the-USA marine grade shock cord Made for larger boats. Better use with Use with a 16'-24' boat. Available with a Zinc Plated Clasp or Stainless Steel Clasp. Both options are corrosion resistant