To be secure against cutting torches and mechanical cutting tools like saws and rotary type grind/cutting wheels...
You need very thick steel... over 1/2 inch thick minimum, 1 inch plus is best.
But you are looking at several thousand dollars ($4000)for an average sized 10 gun safe.
Those small safes will keep the curious out, and if mounted well, will deter the opportunity or smash and grab thief, but not one who comes prepared with tools because they know they need to break into a safe.
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