T L Thirty By Six. Of course different parts of the country say things differently. As far as safes go, many people call Diebold safes Dye Bold, when in fact it is Dee Bold. They even ran ads that said "Diebold Safes - Never Say Die".
You can also say a tool rated safe with a six side rating. It won't really matter how you say it. We will all know what you're talking about.
