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4 Start T Type Copper Nut 2mm Pitch F450 Quadcopter Frame Intruder Security Alarm: Pair Intruder Security Alarm: Pair with a PIR motion sensor and Arduino to trigger a loud audible alert when motion is detected in a secured area wrap with repair tape or professional engineer Low Friction & Self Lubricating: Copper alloy construction ensures smooth operation against steel lead screws with minimal wear
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