These premium exterior wood screws are engineered for superior performance in outdoor decking applications. The 3-1/2-inch screws feature a T-25 star drive head with 6 contact points that grip tightly to prevent stripping and ensure smooth, efficient installation. The countersinking head design, aggressive threads, and smooth shank work together to deliver optimal holding power up to 1200 pounds of shear strength. The green epoxy coating provides excellent rust resistance for long-lasting 3-1/2-inch size is ideal for most decking projects, while the self-tapping point eliminates the need for pre-drilling in most wood applications. These structural wood screws feature a modified truss washer head with a 0.63-inch diameter for proper load distribution. The full-thread design and coarse thread pitch of 0.26 inches ensure maximum grip strength and superior pull-out resistance in both soft and hardwoods.