You have a choice of many head and nut styles, as well as the choice of washers and lockwashers under the screw head or under the nut. Threads may be standard depiction of fully formed. Threads may be partial or full length. You may choose Outline to outline the objects with the Outline style. Choose Opaque to fill the outlined objects with a white fill so that they obsure objects in the background.
Here's how the tool draws a typical screw.
And in 3D mode the tool is the same except that it works in conjunction with WildTools 3D.
You set things up in the tool's dialog.
Then draw a 3D screw.
Go back to WildTools