The threads on sheet metal screws are designed to pull two materials tightly together.
6.Size: #4 X 1/4 inchPan 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.Sheet Metal Screw, Self-Tap Pan Head Phil Drive #4 X 1/4in Zinc Plated Steel 50PK When attaching metal to wood, it is especially important to pre-drill a hole.3 and SAE J933.