Easy to use: Spring-loaded bolt can be locked in the open position as needed. If you have any questions about the product, please feel free to contact us. Made of heavy steel, durable and corrosion resistant. Recommended for construction site storage and over-the-road trucks to add extra security for your belongings. Be sure to remove the keys after locking. Ensure the security of your trailer gate with the Steel Weld-On Spring Latch Lock Assembly. Designed for robust functionality, this latch features a heat-treated pin that offers enhanced durability and resistance against wear Aazon.co: GearTrust Weld-on Spring Latch Lock, Heavy Duty Spring Widely Application: For use with Car Trailers. Easy to Install - Twist to extend the pin to counterpart 5/8'' diameter hole for locking securely. Product Design - This pack includes 2 trailer latch with a heavy-duty weld-on design,ensuring a robust and secure installation Trailer Latch Spring Latch Lock, Weld-On Spring Latch Assembly, Trailer Gate Small Springs