Proven Industries Model 400XL Puck-Lock Set – 2 Pack, Black | Made in USA

Secure trailer access with the Proven Industries 400XL puck locks

When you need dependable protection for enclosed trailers or side doors, the Model 400XL puck-lock set combines rugged construction with practical design. Cast from aircraft-grade 6061 aluminum, these locks offer a sturdy, corrosion-resistant profile that performs in varied outdoor conditions while remaining surprisingly lightweight for easy handling.

Key benefits at a glance

• Heavy-duty puck locks built to resist tampering, with a hidden, fully shielded shackle that helps deter bolt cutters and prying tools.
• Unique key design and a convenient keyed-alike setup — each lock includes two keys, simplifying access across doors.
• Large back opening and precise shackle dimensions designed to accommodate swivel hasps on enclosed trailer doors.
• Made in the USA, emphasizing local manufacturing standards and attention to craft.

Real-world usage scenarios

Picture a remote loading dock or a busy job site where quick, reliable security matters. The 400XL locks stay cool in the sun yet remain robust under wind, rain, and dust, helping to keep rear and side doors secure between pickups. The shielded shackle minimizes exposure to cutting tools, while the keyed-alike system reduces the number of keys you need to carry on each job.

Technical highlights you can rely on

• Construction: aircraft-grade 6061 aluminum for strength and corrosion resistance.
• Security design: hidden, fully shielded shackle to hinder attempts at forced entry.
• Keying: unique key design with two keys per lock, all keyed alike for convenience.
• Fit and dimensions: back opening supports swivel hasps; shackle opening is 1 3/4 inches long by 1 3/4 inches wide with a depth of 1 1/4 inches.

Pack contents: a set of two puck locks, ready for two doors or a paired trailer setup. If you value local manufacturing, thoughtful design, and straightforward security, the Proven Industries 400XL puck-lock set offers a practical option built to endure real-world use.