GRK Fasteners R4 01105 Decking and Framing Screw, #9 Thread, 3-1/8 in L, W-Cut Thread, Flat Head, Star Drive, Steel, 425 ICE SCRAPERS Its solid aluminum body construction

Its solid aluminum body construction with CNC-machined edges ensure an accurate reading every time

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GRK Fasteners R4 01105 Decking and Framing Screw, #9 Thread, 3-1/8 in L, W-Cut Thread, Flat Head, Star Drive, Steel, 425 ICE SCRAPERS Its solid aluminum body constructionGRK's R4 self countersinking screw has a patented underhead with saw blade like cutting teeth and six self contained cutting pockets. Together they act similar to a circular saw blade, transporting the drill dust away from the edge of the screw hole while cutting a ideally clean hole into even the most brittle materials without cracking any surface treatment. Fast bite tip eliminates pre drilling and provides a fast start for one step installation W