10 x 2 1/2 Simpson Bugle-Head Wood Decking Screws - Square Drive T17 316 SS - 1 lbs Pack (82) . 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. 316 stainless steel is ideal where superior corrosion resistance is required.