The Kreg SPS-F075-500 is a box of 500 3/4" pocket hole screws. The fine thread of these screws are the preferred choice in hardwoods as they eliminate any chance of splitting the wood. Ash, oak, maple, walnut, hickory, cherry, mahogany, and birch are all easily fastened with the SPS-F075-500 screws. The SPS pan head is a slightly smaller head size that allows it to easily get below flush when joining 3/8" material. This is particularly helpful when joining 3/8" to 3/8" plywood for drawer boxes.