Spax PowerLags 5/16 In. x 4 In. Washer Head Exterior Structure Screw (12 Ct.) Pack options:Pack of 1 %search_data%620100CSRF

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4 mil (thousandth of an inch) film and 18 mil cross scrim

and very pliable

Stainless steel for rust-resistant and ACQ safe - safe to use with premium woods including cedar and redwood

Spax PowerLags 5/16 In. x 4 In. Washer Head Exterior Structure Screw (12 Ct.) Pack options:Pack of 1 %search_data%620100CSRFSpax PowerLags Screws have a washer head with T Star Drive and HCR (High Corrosion Resistant) exterior coating. Provides a new level of fastening efficiency and reliability to construction. Engineered specifically for demanding wood to wood structural applications, PowerLags feature patented thread serrations that eliminate pre drilling and dramatically increase installation speed requiring up to 40% less driving torque to increase installation speed.