Sheet metal screws, or tapping screws, are highly versatile. Though they are designed to attach metal to metal, they're also used to attach metal to wood, fiberglass, and plastic. Great for general repair around the house, their sharp threads draw materials together and ensure a secure hold. Sheet metal screws are fully threaded with a sharp point. A pre-drilled hole is required for installation. * Designed for joining metal objects, and attaching metal to wood, fiberglass and plasticSharp threads ensure a secure hold18-8 Stainless Steel finish makes screw perfect for exterior and most marine applicationsDesign makes it easy for them to tap into and tighten against whatever they are being installed intoPre-drilled hole is required for these screws