The SPAX factor - for the craftsman that concentrates on the details, we work for you. For the pro that puts qualify first, we help you create stronger connections, enhance performance and improve results when your reputation is on the line. This high performance wood screw is not your average screw. Designed for structural wood applications and heated treated to grade 5 durability. It is made with carbon steel and coated for lasting results to fasten strongly and securely. U.S made SPAX is your trusted partner for your fastening needs. Do it Once, Do it Right with SPAX.; ; Brand Name: SPAX Sub Brand: PowerLag Callout Size: 1/4 in. in. Length: 5 in. Drive Style: T-30 Head Type: Washer Head Product Type: Structural Screws Number in Package: 12 pk Driver Bit Included: Yes Color: Black Indoor or Outdoor: Indoor and Outdoor Diameter: 1/4 in. Self Drilling: No Grade: 5 Grade Finish: High Corrosion Resistant Packaging Type: Clamshell Thread Type: Serrated Application: Wood-to-Wood Connections Material: Carbon Steel Self Tapping: Yes Drive Size: T-30 Head Height: 0.697 in. Thread Length: 2.375 in. Head Diameter: 0.697 in.