This Zinc Plated Bolt is perfect for preventing corrosion and rust. Great for Boat or Utility Trailer! This Bolt can be used for anything! Check the measurement diagram in the photos and look below to see the exact measurements and match up the bolt you are needing to complete your project. This listing is for (1) Bolt and also includes (2) Galvanized Flat Washers, and (1) Zinc Plated Nylock Nut