Finish outdoor projects with these non-corrosive Reliable screws with zinc plating. Pre-drilled holes get enhanced grip with the full thread 32 TPI shank of these fasteners. Achieve a smooth surface when you plunge these flat head machine screws into a countersunk hole. Screwdrivers stay inside the Quadrex rivets to increase torque tolerance. Buy these 2 1/2 in L Type B fasteners in packs of 100. | Reliable Reliable Fasteners Flat Head Screws – #6 x 2 1/2-in – Zinc-Plated – 100 Per Pack – #1 Quadrex Drive FKMZ632212VP Reliable | Fasteners Flat Head Screws – #6 X 2 1/2-In – Zinc-Plated – 100 Per Pack – #1 Quadrex Drive .