concrete screws
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Concrete Screws Torx Flat Head Hi-low Thread
The design of high-low threads makes solid attachment. High-Low self tapping screws have a double lead thread where one thread is high and the other low for easier penetration into the substrate. The greater amount of material remaining in between the high threads, the smaller minor diameter thread increases contact with the substrate resulting in a stronger grip and increased resistance to pull out and vibration loosening forces.
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