The security tag we have is the one with a small hole on the side.
We remove it with a 2 kg dumbbell.
Hitting very hard didn't work.
Put the tag on the floor (do not need to hold on the tag), flatter side up (see photo with caption). Hold the 2 kg dumbbell with two hands, hit constantly: medium-strength - short distance. The tag cracked open within 10 hits! Manually take out the flat iron attached to the needle. And.. Done.
|put the tag like this (flat side up). hit it with 2 kg dumbbell.|