The anti-theft buckle consists of a steel needle, a plastic shell and a lock core. The lock core is actually a simple device consisting of three steel balls, a steel ring and a spring. The steel ball is normally closed under the spring thrust, and when the steel needle is inserted, the steel ball is tightly buckled in the gap of the steel needle.

The opening of the supermarket anti-theft buckle mainly depends on the magnetic steel above 8000GS to suck the three steel balls with steel needles in the lock core away from the steel needles, and the steel needles can be pulled out of the magnetic buckle smoothly. Magnetic steel above 8000GS is a common strong magnetic lock opener for cashiers.

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The internal structure of the anti-theft buckle is basically composed of nails, springs, steel balls, coils and other accessories.

When in use, we only need to nail the matching nail with groove into the product, and then clamp the anti-theft buckle from the other side, and the small steel ball in the anti-theft buckle will slide down along the groove position of the nail to clamp the anti-theft buckle. Therefore, it is the key to open the anti-theft buckle and move the position of the small steel ball. So it also involves the principle of magnetic decoder.

The decoder of commodity anti-theft buckle is actually a magnet with great magnetic force. Through the attraction of super magnetic force, the small steel ball in the anti-theft buckle is moved to unlock it.