Daggerz™ Dagger-Lok hinge screws are a high quality screw designed for general wood fastening applications. The flat head allows the screw to self-countersink and sit flush in the wood. The deep threads provide maximum holding power in softwoods and hardwoods. The phillips drive offers a self centering feature. These screws work great in most woods, including hardwoods and plywoods. The zinc finish is recommended for installations in dry interior environments only.