Kreg Zinc screws are a good choice for a variety of indoor projects with limited exposure to the elements. Zinc screws provide adequate rust protection and serve as a cost-effective alternative to our protective bluekote and rust-proof screw types. At first glance, a Kreg screw may not look much different from other wood screws. But dont be fooled: theres a lot of serious engineering. Compare a Kreg screw to an ordinary wood screw or drywall screw (which many use as a general purpose screw for construction) and you can see that the Kreg screw has unique properties that these other screws do not have. Each of these features is there to ensure you get the best possible results.