CTM/PTR locks are extremely durable locking systems intended for refrigerated semi-trailers and containers used for maritime and road transport.

They act by locking the closing rods, which upon engagement do not allow the doors to be opened. One of their advantages is that they require no tampering with the structure of a semi-trailer/container.

They are manufactured from stainless steel and meet the requirements set out in AISI 304. The lock is protected from reaming and contamination.  It is possible to set the exact code for various mechanisms