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. Self-tapping coarse threads and self-drilling points with the Beaver Bite requires less driving torque. Grade 305 stainless steel. 1 square drive bit is included with each box. Suitable for new treated lumber.