I used both diamond discs on thick plaster when installing a new control panel in an exterior wall. The picture shows a 1/2" x 1/2" channel cut out to make room for the hinge, plus a partial fold. Diamond cutting discs were the ideal tool for finishing corners and details. The main cuts were made with a 3 3/8 inch diamond circular saw, although the plaster was too thick in places so a semi-circular disc had to be used to finish the cut and eliminate rough edges.
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