Pocket screws are used with a boring machine that drills holes slanting horizontally through the face of wood. The "pocket" is the hole where the screw head fits. Normally, pocket screws have a small head to fit down inside the hole, but you can use drywall screws if you take a minute to size the end of the hole with a drill. You can adapt any drywall screw to be used as a pocket screw.
Things You'll Need
Pocket boring machine
Oak hardwood, 3/4-by-3-by-12 inches
Drill the hole normally in the wood with a pocket boring drill.
Place a Phillips head tip on a cordless drill.
Insert the Phillips tip into the pocket and turn on the drill. As the drill is spinning turn the handle of the drill in a circular motion, angling the tip inside the pocket as you bore the pocket out bigger.
Pull the drill out. Insert the drywall screw. Screw the drywall screw down as far as it will go into the hole.
Measure the length of the screw sticking out of the pocket. If it it is any less than 1/2 inch, remove the screw and bore out the hole more until you have up to 3/4-inch penetration.
Start out with the same length of screw. If your pocket boring machine is set for 1½-inch pocket screws, use a 1½-inch drywall screw.
Always wear safety glasses when working with wood.