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. While it is designed for wood applications it is also functional for other materials like masonry, drywall, plastic and up to 24ga steel. Masonry and concrete do require pre-drilling. It is made with carbon steel and coated for durability 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 Callout Size: No. 10 in. Length: 3 in. Color: Gray Drive Style: Star Head Type: Flat Head Product Type: Deck Screws Number in Package: 16 pk Self Tapping: Yes Material: Steel Finish: HCR-X Driver Bit Included: No Thread Type: Serrated Self Drilling: No Packaging Type: Clamshell Indoor or Outdoor: Indoor and Outdoor Grade: 5 Grade Drive Size: T-20+ Thread Style: Partial Threaded Head Size: 0.39 in. Thread Length: 1.60 in. Application: Multi-Purpose