WHAT DOES TYPES OF SCREW HEADS WITH PICTURES MEAN?

When using a punch Instrument such as this, a worker presses the sharp stop from a workpiece, accompanied by hitting the blunt close with a hammer or mallet, after which the sharp end is going to be pushed to the workpiece.Except you pre-drill a hole before you use a normal wood screw, working with wood screws on an MDF area will almost always lead