Cutting into Cement Sheet

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Hi all. I am installing a Whirly Bird on the roof and I need to put in some air vents under the eaves. I have to cut into the cement sheet. I used a jigsaw and stuffed my blades pretty quick. My questions are - Is there a diamond tip jigsaw blade available? Or alternatively is it better to use a angle grinder. I have a grinder but it uses 100mm discs. I saw in the hardware store that the dry diamond tip discs were 105mm - will these discs fit my grinder?


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