Most SS Screw has slot heads and are driven with slotted, or standard, screwdrivers. or standard, screwdrivers. Phillips-head screws have crossed slots and are driven with Phillips screwdrivers. For most home repair purposes, wood screws will suffice. Sheet metal screws, machine screws, and lag screws Wood screws are usually made of steel, although brass, nickel, bronze, and copper screws should be used if there is potential for corrosion. For optimum wood screw performance, you need to drill first. Machine screws are bluntly ended screws used to fasten metal parts together.