Powerpro, LB, Clear, 10 x 1.5", ZXL Premium Metal To Wood Self-Drilling Roofing Screws, Designed To Fasten Steel Roofing To Wood Purlins Used In Post Frame Construction & Plywood Or OSB Used In Residential Construction, Produced With Coating With Enhanced Corrosion Resistance Over Painted Heads, 2.5 Mils Of Powder With Chromate Sealer, Molded Diecast Zamac 3 Zinc Aluminum Alloy Provides Lifetime Protection Against Red Rust On The Head & Washer, Threads Transition From Fine To Coarse To Generate Superior Holding Strength In Various Wood Substrates, Micro Bit Point Reduces Metal Shavings That Can Embed Themselves In The Rubber Washer, Starts Fast Finishes Straight, Pro-Stick Bit Included, 40 Year Warranty.