Wood Screw, #8, 2-1/2 in, Zinc Yellow Stainless Steel Square Drive, 1000 PK, Senco, Mfr#: 08F250YK

Square recess provides excellent torque transmission for high torque applications. Flathead provides strong holding power for most wood applications. 2/3in thread prevents gaps between the sheathing and support studs which can cause squeaks.