Grip-Rite P212STGD40 #9 x 2-1/2 in. Gold exterior self-starting flat head wood deck screws feature a T17 point for easy, hassle-free installation. PrimeGuard Plus zinc coating protects these fasteners from corrosion and rust, prolonging the life of your deck. Improved thread design and nibs under the drive head reduce slippage in your treated wood and wood to wood deck.