The Malco Zip-In #7 x 1/2 in. Steel Hex-Head Slotted Self-Piercing Sheet Metal Screws (1，000-Pack). Feature fine， sharp points and single starting threads on each screw. A second thread above each point engages after initial penetration and helps drill the screws in quickly.
Bright zinc-plated steel construction
Full 1/4 in. heads resist stripping out of hex driver openings
Slots on flat， no corners
Heat-treating process produces fine， sharp points with strength
Single starting threads help penetrate material
Second threads above each point engage after initial penetration and help drill the screws in quickly
Capacity for fastening heavy sheet metal gauges
Highly versatile
Common project applications: roofing， HVAC， steel stud framing， gutters， and register vents
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