This universal trailer lock protects your valuables like no other. The UMAX50D features an exclusive dual-purpose design - remove the ball and it lays flat to secure small wheels, tires, poles and more. But snap it into place and this hardened steel security system shields your trailer, camper or boat from would-be thieves with 360 degrees of protection. Whether you're away for hours or days, the UMAX50D provides instant peace of mind so you can enjoy your trip worry free. Its versatile, removable design and rugged construction means this lock will stand the test of time - and intruders.