HeadLOK eliminates the need to predrill and hand-ratchet in 3/8 inch galvanized lag screws in wood-to-wood projects. HeadLOK's aggressive threading and sharp gimlet point allows it to zip right into wood or OSB without predrilling. Plus, the wafer head eliminates the need for washers and offers increased pull through strength. Perfect for deck framing, stair stringers, fencing, cabinets, and more! Sizes are perfect for virtually any dimensional wood-to-wood project.