HeadLOK is a heavy-duty wood screw that is ideal for wood-to-wood connections including decks, fences, headers, installing kitchen cabinets, kitchen islands, stairs, rigid foam and more. Installation has never been easier with the addition of the TORX ttap drive system. TORX ttap is a premium drive system that combines the patented ttap with button with the TORX drive to provide superior bit engagement for a stable wobble-free installation making screw driving faster, easier and enabling single hand installations. The ttap stability button provides unmatched wobble-free installations and eliminates fastener strip-out. The stability button keeps the fastener straight through installation. The HeadLOK fastener is compatible with standard T30 driver bits.. Drive Style: Torx. Fastener Base Material: Exterior Wood. Fastener Color: Black. Fastener Material: Carbon Steel. Fastener Plating: Electro Galvanized Zinc. Fastener Type: Structural Screws. Features: No Additional Features. Grade: Not Graded. Head Style: Flat Head. Included: Driver Bit. Interior/Exterior: Exterior,Interior. Measurement Standard: ASTM. Measurement System: Inches. Package Quantity: 50. Product Weight (lb.): 2.95 lb. Returnable: 90-Day. Thread Pitch (mm): 3 mm. Thread Style: Coarse Thread. Threads Per Inch (TPI): 12 TPI. Screw Length: 6 in. Size: 3/8 in. Screw Length: 6 in. Head Style: Flat Head. Package Quantity: 50. Size: 3/8 in. Drive Style: Torx. Fastener Material: Carbon Steel. Interior/Exterior: Exterior. Fastener Type: Structural Screws