All Tri-Lok accessories are designed to make sure the Tri-Lok safety plug locks do their job. The 1400 Universal Door Lock Release Flag attaches to many slide door type interlocks, by alternate means, to enable the use of our 1420 Universal Door Lock Release Tool to accomplish the manual release of the interlock. The Universal Key is a 1/4" aluminum rod approximately 7" long with a WARNING TAG and cylinder key on one end.  The release end is beveled.