The centering insert 68/74 makes it easy to enlarge existing installation openings Ø 68 mm auf Ø 74 mm. This can be with lightweight walls with single or multiple-layer boarding consisting of lead-free radiation protection panels (e.g. Knauf Safeboard) and of lead-lined plasterboard panels. This makes the later replacement of existing traditional cavity wall boxes with radiation protection boxes much easier. The centering insert 68/74 mm is an easy-to-use tool aid fo Ø 74 mm cavity wall cutters (e.g. MULTI 4000) and provides the exact guide for expansion of the installation opening.

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