Powerpro, 250 piece, 10 x 1.5", clear, wb premium metal to wood 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 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, 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.