Altor has created the first trailer lock that is designed to resist power tools. Where most locks can be cut in seconds with power tools, the SAF Trailer Lock features design and geometry, constructed from a hardened cast steel construction that can resist even an angle grinder. The premium high security disc detainer lock is drill resistant (endorsed by the LockPickingLawyer!) The easy to install lock is available for 2 or 2-5/16" couplers.