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cplcarlman t1_j3jgjli wrote

Reply to comment by Junmeng in How keys works. by -birdbirdbird-

One way to open locks is to use a drill bit to drill right above the top of the keyway. The idea is to completely obliterate the "shear line" which is the line between the inner cylinder, called the core, and the outer part. That's why many high security locks have hardened steel pins or disks embedded at the top of the core.

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dankdooker t1_j3lq4xl wrote

My landlord tossed all the hardened steel inserts because he didn't drill the hole big enough to fit it. All the locks just have the thin piece of decorative tin on the outside.

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