Elevate your outdoor construction projects with SPAX Double Thread Screws. Designed for unmatched durability and performance, these screws are engineered with a unique double thread that ensures a tight, secure connection between wooden pieces. The innovative design features a small gap between threads, which creates a powerful clamping effect and prevents loosening over time. This results in a strong, gap-free bond, making them ideal for decking, fencing, and other wood applications. Crafted from premium 304 stainless steel, these screws offer exceptional corrosion resistance, making them perfect for use in outdoor and coastal environments. The flat head provides a clean, flush finish, while the patented tip with cutting serrations ensures faster, easier driving. The T-STAR Plus drive system enhances bit engagement compared to traditional Phillips and square drives, delivering a more secure hold. Fully compliant with code requirements, these screws are suitable for use with ground contact, pressure-treated, and fire-retardant lumber. SPAX screws meet industry standards including AWPA UC1-UC4B, UCFA, and UCFB, guaranteeing reliability and performance. Key Features: Double Thread Design: Provides a secure connection, preventing gaps and loosening. Clamping Effect: Ensures tight, stable wood connections, perfect for decking and fencing. High Corrosion Resistance: Made from 304 stainless steel for long-lasting durability. Innovative Tip: Patented cutting serrations for easier and faster driving. T-STAR Plus Drive: Superior bit engagement for a more secure hold. Product Specifications: Material: 304 Stainless Steel Drive Size: T20+ Head Type: Flat Head Head Size: 0.305" Thread Length: 0.700" Double Threaded Perfect for contractors, DIY enthusiasts, and woodworking professionals, SPAX offers unmatched performance and reliability for all your outdoor construction needs. Experience the difference with SPAX—where quality, performance, and reliability meet.