Main function: Designed to replace the old and broken one, extending the life of your 4-inch wireless electric mini chainsaw. High-quality material: Made with wear-resistant and durable material, ensuring long-lasting use. Efficient work: The steel tooth design prevents the chainsaw from getting stuck in branches, improving cutting efficiency. Easy to replace: Adjust the tightness with the wrench and tighten the screw. Wide applications: Ideal for cutting wood, pruning tree branches, and performing gardening tasks in gardens, orchards, farms, parks, and other places.