The threads on sheet metal screws are designed to pull two materials tightly together.
6.Sheet Metal Screw, Self-Tap, Flat, Phil Dr #6 X 1/2in 18-8 Stainless Steel 25PK When attaching metal to wood, it is especially important to pre-drill a hole.3.Size: #6 X 1/2 inchFlat Head, Phillips DriveUsed to attach sheet metal to other thin metal, wood or other materialSharp pointed tipPilot hole should be pre-drilledThread Type: Type A, Point Style: SharpSpecification(s) Met: ASME B18.