Kreg No. 8 x 1-1/2 in. L Square Zinc-Plated Pocket-Hole Screw 500 pk Pack of 2. Packaging may vary. Kreg zinc screws are a good choice for a wide variety of indoor projects with limited exposure to the elements. Zinc screws provide adequate rust protection, and serve as an affordable alternative to the more protective Blue-Kote and stainless screw varieties.