7 x 2 1/2 Simpson Trim-Head Wood Decking Screws - Square Drive 305 SS - Bulk Pail (2500) . The type 17 tip provides fast starting and resists splitting in hardwood. Coarse threads run approximately 2/3 up the shank to draw the decking tightly to the substrate. Pre-drilling is recommended near board ends to prevent splitting. #1 Square Drive - All #7 diameters and 9 x 3 1/2 #2 Square Drive - 9 x 4
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