Small Parts 0816KPM Steel Self-Drilling Screw, Zinc Plated Finish, Modified Truss Head, Phillips Drive, #2 Drill Point, #8-18 Thread Size, 1" Length (Pack of 100): Amazon.com: Industrial & Scientific
Hylex Self Drilling Screw, Dia- M3.9mm, Self Drilling screws are very good for quick assembly of roofing sheets and other similar things.A Self-Drilling Screw is a Self-Tapping Screw with the added feature