Proven Industries Puck Lock Set 400XL – 2-Pack, Hidden Shackle, Keyed Alike, Made in USA

Secure, User‑Friendly Coverage for Enclosed Trailers

The Proven Industries Puck Lock Set, Model 400XL, arrives as a rugged 2‑pack designed to protect rear and side doors on enclosed trailers. Its concealed shackle and pick‑resistant puck mechanism are built to deter tampering, while the sturdy lock body shields against impacts. Finished in a durable black coating, this set blends security with a streamlined appearance for daily transportation needs.

Built for tough jobs and unpredictable weather, the 400XL uses a solid 6061 aircraft‑grade aluminum body. This material choice helps resist corrosion and tampering, so gear stays locked down across seasons and miles. The shielded shackle area minimizes exposure to common theft attempts, giving you a practical layer of defense without added bulk.

Key Fit, Versatile, and Easy to Use

Designed to fit rear and side doors configured with swivel hasps, the lock’s enlarged rear opening accommodates typical enclosed trailer hardware. This ensures a confident fit right out of the box, reducing installation time on daily routes.

• Concealed shackle blocks bolt cutters and prying tools for enhanced deterrence.
• Pick‑resistant puck mechanism provides an added layer of protection.
• 6061 aluminum construction resists corrosion and stands up to demanding work.
• Back‑of‑the‑pack fit works with common swivel hasps for trailers.
• Shackle opening measures 1 3/4 in x 1 3/4 in, depth 7/8 in for confident engagement.
• Black finish complements most trailer aesthetics while signaling security.

The 400XL comes as a convenient 2‑pack with a keyed‑alike design. Each lock includes two keys, and every key operates both locks in the set. This simple arrangement reduces key clutter and streamlines access for owners, drivers, and fleet managers, helping speed up loading and unloading routines across multiple doors.

Quality Made in the USA with Practical Benefits

Made in the USA, Proven Industries emphasizes consistent materials and craftsmanship. Tight tolerances and routine quality checks support dependable performance, so you can rely on the locks daily. While no security system can guarantee outcomes, the combination of a shielded shackle, corrosion‑resistant body, and keyed‑alike convenience positions the 400XL as a thoughtful option for safeguarding valuable gear on the road.

Whether you’re outfitting a single trailer or a small fleet, the 400XL 2‑pack offers a balance of deterrence, durability, and practical usability that aligns with typical trailer security needs. It’s a compact, robust solution that can adapt to the demands of delivery, service, and construction workflows, providing peace of mind without overpromising results.