Senco Duraspin No. 8 Sizes X 2-1/2 in. L Square Flat Head Exterior Screws 1000 pk

Square recess provides excellent torque transmission for high torque applications. Flathead provides strong holding power for most wood applications. 2/3 thread prevents gaps between the sheathing and support studs which can cause squeaks. Type 17 point quickly penetrates wood reducing drive time.