ISC Klick-lock Buckles can only be opened when both of the release buttons are fully depressed. This feature reduces the risk of accidental opening. When loaded, ISC Klick-lock Buckles cannot be opened by hand (even when both release buttons are depressed.
ISC Klick-lock Buckles are tested without webbing, in a straight line (direct pull), in line with the ANSI Z359.1 Standard. This method gives an accurate, genuine measure of strength.
Some manufacturers test their buckles with the buckle sewn in to a webbing loop, which can give misleading results (with this method, the webbing shares part of the load).