Hillman 126741 #12 x 3-1/2" Flat Head Square Drive Wood Screw Zinc-2/Pack

A wood screw is a thread forming screw with sharp threads at a coarse pitch. It is used for directly fastening two wood surfaces. Its smooth shank allows the screw to pull the two pieces of wood together for a tight joint that prevents the wood from pulling or splitting. Wood screws also taper along the threaded portion optimizing the screws holding power in wood.
Pre-drilling is recommended
For wood applications
Undercut head means only the shaft of the screw penetrates the wood to avoiding splitting
The unthreaded portion of the shank is to slide through the top board closest to the screw head so that it can be pulled tight to the board it is being attached to
Zinc plated for moderate corrosion resistance
They are commonly available with flat, pan, or oval heads
#12 x 3-1/2″
Two per package