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 Sub Brand: Multi-Material Callout Size: No. 10 Label Length: 1-1/2 in. Drive Style: Unidrive Head Type: Flat Head Product Type: Construction Screws Number in Package: 15 pk Driver Bit Included: No Color: Silver Indoor or Outdoor: Indoor Diameter: No. in. Self Drilling: No Grade: 5 Grade Finish: Zinc-Plated Packaging Type: Boxed Thread Type: Serrated Application: Multi-Purpose Material: Steel Self Tapping: Yes