High-Efficiency Modified Zinc Alloy: This kit contains 4 high-efficiency sacrificial zinc anodes made of optimized zinc alloy materials with excellent electrochemical properties. Designed to protect ship lifts, seawater swimming pools (prevent harmful electrolytic corrosion) and dock structures, it can provide long-term and efficient cathodic protection. Active Sacrificial Protection: Zinc anodes protect more important metal parts (such as ship lifts, rails, pool equipment, dock piles) from damage caused by seawater electrolytic corrosion by preferentially corroding (sacrificing themselves), extending the service life of equipment. Saltwater & Pool Corrosion Defense: Specifically engineered to protect submerged metal parts (ladder fasteners, underwater bolts) in saltwater and conventional pool systems. Reduces maintenance frequency and ensures reliable system operation by combating electrochemical corrosion. Corrosion-Proof Installation System: Includes 10-foot 316 stainless steel cables (superior seawater resistance) and 3 heavy-duty crimp fittings per anode. Ensures secure, long-term connections in harsh marine environments with quick, tool-free installation – saving time and effort. Cost-effective Package: A 4-piece zinc anode combination is provided at one time to meet the protection needs of multiple key parts. It is a practical and economical choice to protect your marine lifting equipment, saltwater pool systems and dock facilities. Protect your marine investments with our 4 Pcs Zinc Anode for Boat Lifts. Designed specifically to combat electrolysis, these high-quality zinc anodes are essential for safeguarding boats and dock systems in both saltwater pools and marine environments.