OVERVIEW: Strong-Tie SDWS Timber Screws feature a 4CUT tip which eliminates the need for pre-drilling, saving valuable time compared to using traditional lag bolts. Each SDWS screw features a double barrier coating that is equivalent to hot dip galvanization, making them suitable for some exterior and preservative treated wood applications. KEY FEATURES: Double Barrier Coating 4-inch SDWS Timber Screw