The first series of Jensen MetalTech secure utility enclosure lids carrying the LockLid™ brand is the K Series. The patent pending locking mechanisms work with the use of cams. When security fasteners are tightened, a wedge moves into place spreading the cams outward to grab the inside of the pull box, or handhole. Smaller lids are designed with one locking mechanism that creates a four-point connection with the interior of the box. Larger lids utilize additional locking mechanisms.
The video on the upper right side of this page demonstrates the design features of the K-Series LockLid™, installation and removal of these secure lids, and reveals the results of a Jensen MetalTech field test for security.
Click image to enlarge.