The only U.S. patent locks, with ultimate trailer theft protection.

Advanced Puck Lock Technology

The Sole Patented Manufacturer To Hide The Screws & Nuts And Protect Adjustable Coupler Channel With Rectangular Tube All With 1 Puck Lock. U.S. Patent 11,912,081

THE TWO-BOLT

Fits Any Two-Bolt Lunette Ring Trailer Setup

COBRA PUCK LOCK

Hardened Steel Puck Lock with flat-back design

THE FOUR-BOLT

Fits Any Two-Bolt Lunette Ring Trailer Setup

Features Of The Four And Two Bolt Models

Proudly Manufactured In Michigan

Expert craftsmanship and superior quality, made with pride in Michigan, USA.

Built To Last, Guaranteed For Life

Your security is our commitment, backed by a lifetime guarantee.

Worldwide Shipping Available

Secure, fast global delivery will bring our products to your doorstep in 3 to 5 days.

Custom Lock
Features

Our locks are made custom with unique designs that provide the highest level of security.

Uncover The Advantages Of The Mean Dog Lock

See What Makes Us Apart

Versatile Lunette Ring Lock For 2 And 4 Bolt Configurations

Group 3340

Heavy Equipment Protection You Can Trust

Keep Your Landscaping Trailers Safe

Secure Your Dumpsters With Confidence

Chippers, Generators, And Beyond: Secure It All

Your Lock, Your Color

Customize your lock with a color from your favorite NFL club to make it uniquely yours

Ball-Lock: A New Security Innovation Coming Soon

The Ball-Lock is set to redefine security with its advanced design and high-strength materials. Perfect for securing trailers and heavy equipment, this new lock will offer unparalleled protection. Keep an eye out for its release and be ready to experience the best in security technology with the Ball-Lock.

Satisfied Customers Share Their Stories

Check out what our customers are saying about our locks and security solutions. See why they recommend our products for ultimate protection.

Satisfied Customers Share Their Stories

Check out what our customers are saying about our locks and security solutions. See why they recommend our products for ultimate protection.

News And Media

A Buyer’s Guide To Lunette Ring Locks For Florida’s Outdoor Enthusiasts

Florida is known for its sunny weather, breathtaking beaches, and a culture that thrives on outdoor adventures. Whether you’re an

Why Lunette Ring Locks are the Best Choice for Indiana’s Industrial Trailers

When it comes to securing industrial trailers in Indiana, choosing the right locking system is critical. From heavy equipment to

Top Benefits Of Using Lunette Ring Locks for Michigan’s Heavy-Duty Trailers

When it comes to securing heavy-duty trailers, especially in industries like agriculture, construction, and transportation, the lunette ring lock is