0.220" x 10" Strong-Tie SDWS221000DBBR50 Timber Screw - Double Barrier Coating, Black | Qty. 50 Reinforcement Alignment It also includes obround holes

It also includes obround holes spaced 3" apart for I-joist purlins and square holes spaced to accommodate the narrow face of 2x solid-sawn purlins

and livestock shelters in challenging environments

Ideal for fastening wood nailers

Marine construction and dock hardware

0.220" x 10" Strong-Tie SDWS221000DBBR50 Timber Screw - Double Barrier Coating, Black | Qty. 50 Reinforcement Alignment It also includes obround holesSimpson Strong Tie SDWS Timber Screws (Exterior Grade) are your go to fasteners when strength and weather resistance matter. Ideal for outdoor framing, landscaping, or heavy duty builds, these structural wood screws help DIYers get pro level results without the need for pre drilling. Coated with a high performance Double Barrier finish, they resist corrosion from rain, moisture, and treated lumber. The large washer head adds serious clamping power,