This tutorial will show you how to hold your images together with realistic looking screws.

Step1:
Make a circular selection.

Tip: Hold down Alt/Option to draw from the center. Hold down Shift to draw a perfect circle. To move the selection while drawing, hold the spacebar.

Step2:
Select the gradient tool. black to white circular gradient. Make sure you check the reverse box on the top bar.

Step3:
draw the gradient starting from the center and you should have something like this.

Step4:
Now how about the slot?

Make a new layer. Draw a long rectangle and fill with dark gray.

To trim the slot: Ctrl/Cmd click on the layer 1 thumbnail to select it. With the top layer active hit Ctrl/Cmd+Shift+I to invert the selection. Press the delete key. Now you should have a nicely trimmed slot.

 

Step5:
To make the slot look recessed:

Add a layer style to the slot. Hit the little "f" at the bottom of the layers pallette. Use inner shadow wih the default settings except for the size, move that up a little bit for more realism.

Step6:
To make the slot look recessed:

Add a layer style to the slot. Hit the little "f" at the bottom of the layers pallette. Use inner shadow wih the default settings except for the size, move that up a little bit for more realism.

Tutorial Source