The world's best padlock design for your trailer couplers! Please measure your application in advance to ensure the lock is the right fit. | Guarded shackle protects the padlock from bolt cutters and grinders. | Machined from solid aluminum resists torch attacks that defeat casted padlocks! | Best in class high-security 6-pin cylinder for pick, bump, and rapping attacks! | PACLOCK offers the widest variety of keying! Made in USA w/ global components by family manufacturer hiring veterans & people with disabilities.