A sheetmetal screw has sharp threads and a reasonably sharp tip that cuts into the material into which it is joining. The process of cutting threads in the wall of a hole is known as tapping.

Refer to the package or manual for drill bit size. Different-sized anchors require different-sized holes and screws. Tap the ...

The result was a combination screw driver wrench and tap or reamer wrench. The drawing illustrates successive stages in the evolution of the tool.