I'd be looking at double-skinned steel, I think. Bloody pricey though.
Any particular reason you choose steel?
Went with a strong timber frame, decent secure hinges and decent locks that aren't that visible.
I assumed steel will be most secure. And I plan to build a whole new garage there one day. What wood did you choose?
@lynx started
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I'd be looking at double-skinned steel, I think. Bloody pricey though.