# Rule files

Download our manufacturing limits as a rule file and load it into your design tool, so the DRC checks the real limits instead of hand-typed numbers. We generate the files from the same table as this site, so they change when the table does.

- KiCad 8-10: https://pcb.express/api/rules/kicad
- Altium Designer: https://pcb.express/api/rules/altium

Headline limits: 0.127/0.127 mm (5 mil) track/clearance, min 0.3 mm hole, 0.13 mm annular ring, 0.3 mm copper to edge.