SPAX 5/16-in x 10-in Black Coated Washer -Head Exterior Structural wood screws 150 -Pack

5/16-in x 10-in Black Coated Washer -Head Exterior Structural wood screws 150 -Pack. SPAX T-Star washer head Powerlags designed with low-profile, large diameter head design provides outstanding clamping force and improved aesthetics - The T-Star drive offers excellent bit engagement without requiring a special driver bit - Available in 1/4”, 5/16”, and 3/8” diameters - SPAX HCR Coating is approved for use in treated lumber.. Cold-rolled “carbon steel” wire heat treated to Grade 5 durability and plated with an HCR (High Corrosion Resistance) double barrier coating - HCR is tested and recognized for use in ground contact pressure treated lumber for exterior, freshwater general construction applications (eg AWPA UC1-UC4A, UCFA).. The ideal replacement for the conventional lag - IRC/IBC Code Compliant: TER-No 1912-07