There's a chance that the metal might crack when only cutting with shears. The hole prevents it cracking. You can also use a nibbler that removes a strip of metal.
@hnhpra4172
3 жыл бұрын
@@FarmandSMC I appreciate your kind explanation. You meant it's a cold day at that time so the zinc panel could crack more than in warm weather, didn't you? It looks to be a cold day at that time at a glance.
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