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8 x 1-1/2 in. Zinc Phillips Square Drive Flat-Head Coarse Thread with Nibs Self-Tapping Double Auger (1000 per Box) 0.FCC08112ZN27 - The Home Depot
10 x 3/4 Inch Self Tapping Sheet Metal Screws, Double Square #2 Head Bit Included, Cargo Trailer Self Tapping Screws, Exterior RV Skin Fasteners, Enclosed Trailer Repair Screws, 250 Pack: Amazon.com: Industrial & Scientific
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KTX Cutter #10 x 4-1/2 in. Ultra Guard Square Drive Flat-Head Coarse Thread with Nibs Double Auger Wood Deck Screws (100 per Box) 0.FSC10412UN27 - The Home Depot
SOLVED] What tool do I use to remove this screw? - Page 2 - Forest River Forums
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11 Strange Screws You Don't See Every Day
8-15X4 Square Drive Flat Head Full Body Wood Screw 2/3 Thread Z
Screw 8 x 1-1/2 Zinc Combo Coarse Double Auger
Bomgaars : Double Hh Mfg Square Head Set Screw 3/8-16 X 3/4, 2-Piece : Set Screws