TacKnives single action spike is operated by pressing the button at the top of the spike. Upon pressing the button, the spike will shoot out with incredible force. To put the spike back, one has to press the spike against a hard surface while simultaneously pressing the actuator button.
The pocket clip can be rotated to cover the release button. This way it acts as a safety from accidentally pressing on the button.
Disclaimer: This spike is extremely dangerous. Please be careful when handling the spike.
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