CUSTOM FIT-SQUARE TUBE and ROUND TUBE Versions: Make sure to double check your drop tube. HEAVY-DUTY: These coupler locks are constructed of 3/16" fully welded cold rolled steel and are hammer, bolt cutter, and crowbar proof! BRIGHT YELLOW POWDER COAT FINISH: We believe in presenting a hard target that is why we use a bright yellow powder coat to warn off would be thieves. Our locks are sand-blasted before powder coating to ensure good adhesion of the coat for durability. PUCK LOCK OPTIONS AVAILABLE: Purchase without a puck lock, or with any one of our three puck lock options. Tailer your lock purchase specifically to your security needs. CUSTOM KEY OPTIONS AVAILABLE ON REQUEST: Send us a message! SUPPORT SMALL BUSINESS: We are a family run and operated small business with our locks designed and proudly fabricated in the USA. LONGEVITY AND RELIABILITY>>THE ORIGNIAL HEAVY-DUTY TRAILER LOCK: We've been in business 10+ years and are constantly inovating new locks for the latest couplers on the market. Our goal is for your trailer security and peace of mind. We've got you covered! NO NONSENSE APPROACH TO TRAILER SECURITY! Our ultra high security latch enclosure for Gooseneck trailers is completely Bolt Cutter Proof. All 3/16" fully welded steel with welded hinges and hinge pins. Heavy yellow powdercoat finish which screams "stay away" Made in America. Limited Lifetime Warranty against manufacturing defects. This hasp and lock combination has proven itself all over America for decades. Only power tools or a cutting torch has any chance against this lock/hasp set-up. Consider adding our drop tube Set Bolt Lock. Even if you drop your latch tube, thieves are carrying around universal latch tubes to insert and steal your trailer. Powdercoat is not warrantied.