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. Say Good Bye to your fathers traditional lag. SPAX PowerLags offer superior installation performance and durability over traditional lag screws and carriage bolts for structural wood construction. Made of carbon steel and coated for long term durability to ensure your project endures. U.S made SPAX is your trusted partner for your fastening needs. Do it Once, Do it Right with SPAX.. Drive Style: Torx. Fastener Base Material: All-Purpose. Fastener Color: Brass. Fastener Material: Carbon Steel. Fastener Plating: Yellow Zinc. Fastener Type: Wood Screw. Features: Self Tapping. Grade: Not Graded. Head Style: Flat Head. Included: Screw. Interior/Exterior: Interior. Measurement Standard: SAE. Measurement System: Inches. Package Quantity: 170. Product Weight (lb.): 3 lb. Returnable: 90-Day. Thread Pitch (mm): 3 mm. Thread Style: Serrated Thread. Threads Per Inch (TPI): 9 TPI. Screw Length: 3-1/2 in. Size: #10. Screw Length: 3-1/2 in. Head Style: Flat Head. Package Quantity: 170. Fastener Material: Carbon Steel. Size: #10. Drive Style: Torx. Interior/Exterior: Interior. Fastener Base Material: All-Purpose