I need to drill a 100mm diameter hole in my ceilng. I have a set of holesaws, but they are too small, so I bought at 102mm holesaw.
Unfortunately it didn't fit the arbour that came with my set, as the holesaw has a circular hole but the arbour has a partially round shaft with two straight edges.
So I bought an new arbour with a circular shaft, but it was too large to fit into my drill.
So, my question is - can I get a 102mm holesaw that will fit my existing arbour, or alternatively can I get an arbour with a circular shaft that will fit my drill?