Wooden screw with circumferentially-distributed reverse four-edge thorns
A wood screw with reverse four-edge thorns distributed circumferentially belongs to fastener nails, mainly comprises a screw head, a screw rod, a ring with four-edge thorns distributed circumferentially, a threaded section and a screw point, and is characterized in that the ring with four-edge thorn...
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Sprache: | chi ; eng |
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