Powerpro, 250 Piece, 10 x 1", Black, WB Metal To Wood Self-Drilling Roofing Screws Contractor Pack, Designed To Fasten Steel Roofing To Wood Purlins Used In Post Frame Construction & Plywood Or OSB Used In Residential Construction, Produced With Dura Seal 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, Edmo Rubber Is Vulcanized To A Steel Washer To Form An Excellent Seal Even When Driven At An Angle, Micro-Bit Point Reduces Metal Shavings That Can Embed Themselves In The Rubber Washer, Starts Fast Finishes Straight, Includes Pro-Stick Bit, 40 Year Warranty.