Powerpro, LB, 10 x 1", Black Finish, 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, HWH With V-Neck Design, Adds Strength & Prevents Heads From Popping, EPDM Rubber Is Vulcanized To A Steel Washer To Form An Excellent Seal Even When Driven At An Angle, 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.