Do it #10 x 3-1/2 In. Stainless Steel Square Bugle-Head Wood Deck Screw (4 Lb. Box)

These self-counter sinking bugle heads set flush with work surface. The square drive, No. 2 head is deep and cleanly formed and is coated with a nonstick clear, dry, lubricating film which enhances driveability. Coarse threads, has a T-17 self-drilling point. Grade 304 stainless steel. Suitable for new treated lumber.