ITW Brands 21404 Series 100PK9x1-1/2 Roof Screw, 9 x 1-1/2" Ideal for metal to wood applications and provides exceptional corrosion resistance especially when fasteningroofing panels to wood structures Self-sealing neoprene washer provides a waterproof seal in harsh outdoor environments Climacoat premium coating means no streaking from corrosion and rust for long life finish in exteriorapplications High performance drive surfaces reduce cam-out to penetrate surface the first time for easy installation Precise sharp point designed to drill, tap, and fasten all in one motion