This zinc plated self-drilling Phillips flat head screw w wings drills a hole and taps a thread in a single operation. The drilling point must fully penetrate all pieces of metal before the first thread engages. Used for attaching lumber headers to steel. Wings ream hole in wood preventing jacking action. Features Meets ASTM1 C 1513 for cold-formed steel framing connections Meets ASTM A 510 for carbon steel manufacturing Meets F.I.P.3-1000.7 for torsional strength and drill speed Meets ASTM F1941 for corrosion resistance Pack of 1000Specifications Finish: Zinc Material: Steel Driver Type: 3 Philips Screw Type: Self-Drilling Screws Head Style: Phillips Flat Head Weight Capacity: 35 Size: 20.25 x 3.25 in. Drill Capacity.: .110 - 375 Weight: 35 lbs - SKU: ITCP2390