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【Premium Carbon Steel Construction】Crafted from high-grade carbon steel with high tensile strength, our 150mm screws long wood screws deliver exceptional durability and rust resistance. Unlike ordinary screws that corrode or snap under pressure, these heavy-duty timber screws are built to withstand outdoor elements and heavy loads, ensuring your structures stay secure for years. 【Hex Nut Head Design for Superior Grip】Featuring a generously sized hex nut head, these heavy duty timber screws provide outstanding torque transfer and high pull-out resistance. This design effectively eliminates common issues like cross-slot cam-out, tip damage, and screw breakage, giving you a tight, wobble-free fastening every time—even in dense hardwoods. 【Precision Thread Design for Split-Free Driving】Engineered with clear, uniform threads and a partial thread design, these long wood screws ensure smooth, stable driving with minimal effort. The optimized thread geometry reduces friction and wood splitting, making installation faster and cleaner—no pre-drilling required for most softwoods, saving you time on every project. 【Versatile Outdoor & Structural Applications】From building decks, fences, and pergolas to securing landscape sleepers, stair stringers, and roof timber frames, these 150mm screws are the go-to choice for a wide range of heavy-duty woodworking projects. Whether you're a professional contractor or a DIY enthusiast, these hex head timber screws deliver reliable performance in both structural and decorative applications. 【20-Piece Value Pack & Satisfaction Guarantee】Each pack includes 20 high-quality M6.7 x 150mm hex nut head timber screws—ample quantity for multiple projects. If you encounter any issues with our product, simply contact us. We're committed to your complete satisfaction and will respond promptly to resolve any concerns.