The openings are precut, but continue to be held by perforated blocks.

The perforated holes are pre-perforated openings that continue to be held by perforated blocks. They can be broken down according to needs. This allows variants to be combined on a single component. For this reason, the punching tools are ideal for the manufacture of control cabinets housings and cable grommets.

Punches can be manufactured with different forms and can punch in both directions.

An alternative to punching with a punch or for larger surface areas is to work with micro-joints. As can be seen in the illustration on the left, the different sheet segments remain joined together by small joints to the remaining louvre. Then, it can be pressed.