Use the Kreg SPS-F150-500 Zinc Pocket Screws with Kreg s pocket-hole jigs to create seamless durable joints. This 500 pack of screws works well with harder materials. They provide moderate rust protection and have a zinc finish and dry-lubricant coating for easier drilling. With a 1 1/2-inch fine thread these zinc screws with pan square drive heads are perfect for dense hardwoods and 1/2-inch thick stock. The self-tapping tip eliminates the need for pilot holes. The smooth case-hardened steel shank ensures a tighter fit while the soft core prevents bending. The flat bottom head fits tightly against pocket holes. At Kreg woodworking is our passion. We take pride in a project well-done and we understand how important the tools at hand are to the final product. That s why we craft the very best woodworking tools. We want our customers to feel confident in their ability to finish quality products with Kreg tools in hand.