Hooded Thief Steals Bicycle in Seconds Using an Angle Grinder in Broad Daylight
Briefly

The bad news is that there aren't any bike locks that are entirely angle grinder-proof, but with technology rapidly advancing, multiple locks offer steel-tough protection.
Materials capable of resisting angle grinders are often too heavy or cumbersome for everyday use, making the lock less practical for cyclists.
Read at Discerning Cyclist
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