Powerpro, 250 piece, 10 x 1″, white, 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 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.