LITTLE KNOWN FACTS ABOUT LEAD SCREW THREAD TYPE.

Also known as pig nose or twin gap, this screw head has two spherical holes which might be reverse each other and resemble a pig’s nose. It's really a safety-fashion screw to forestall tampering. You will need a Exclusive spanner screwdriver for this type of screw head.These screws may be used everywhere around the household, including the bathro

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