Creating Catalog with Bleed, Adobe Illustrator

You may talk with your printer (printing, that's what you need a Bleed for) and very likely suggest you to add a margin of 3 mm (9-10pt) or up to 5mm.

Bleed adds an external margin, for allowing any little rror when trimming or cutting the printed sheet to the final size of your pages.

If you have objects or pictures that touch the current borders or margins, it is advisable you move them out to the bleed margin.