i wona know this too

like this?

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Its a custom pattern, you need to define it and then save as a custom pattern. Then you can access it as a pattern overlay in the blending options.

To make it, you need to get a blank canvas (transparent). Zoom in on a few pixels, then fill in pixels diagonally.

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Crop it to that (or larger if you want to increase the distance or the size of the lines) and then go to Edit < Define Pattern < Name it w/e < Click ok

you then have saved it as a preset, and it is now available for use in your blending options as a pattern overlay.

personally I make a 4x4 transparent canvas, then take the pencil tool and click the bottom left corner then click up to the top right corner like in baps example