Self-tapping screws are usually drilled into pre-made holes (pilot holes) in metals, such as zinc, aluminum, and bronze and its alloys, as well as plastics and resin-impregnated plywood. They create ...

The best tool for tapping precise holes in metal parts and workpieces is—not surprisingly—a dedicated tapper. For years, hole tappers have been the go-to power tool in metalworking and manufacturing ...