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Phillips Flat Head Self Drilling Screws w/ Wings

Also referred to as a Header TEK Screw and used to fasten 2x4's to steel. 
 
Wings | The Nutty Company, Inc.  Wings2 | The Nutty Company, Inc.
Wings ream the hole larger than the threads so the threads will not engage the wood.

 Wings break off when they hit the steel, then the threads engage.

Zinc Plated Steel and 1,000 Hour Daggar Guard Coating

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