Where To Buy Kreg Jig Screws
Kreg Jig Screws 
Kreg Jigs are extremely useful for creating pocket hole joints. I’ve come to love this great tool but it’s only effective when you have the proper screws to use with it. I’ve tried using other screws and it’s really pointless. If you’re going to spend the money on a Kreg Jig then be willing to spend the money on the Kreg screws. Trust me when I say you’ll be glad you did.
Kreg Screw Kit
You can the Kreg SK03 Self-Tapping Pocket-Hole Screw Kit in 5 Sizes if you’re looking for an assortment of screws or you can buy individual boxes of screws from the list below.
Very good advice, especially if you’re joining hardwood. The long, unthreaded shank is critical to pulling the joint tight without splitting the wood or stripping the threading in the hole. The flat bottomed head is also important because a cone head will just sink into the hole, act like a wedge and, again, possibly split the joint.
Don’t use drywall screws in a pocket hole application. I learned that one the hard way.