Known (in the UK at least) as 'tank cutters' - because their original
use was cutting pipe holes in water tanks ! I've used them to cut MDF
disks for basing trees - their main problem is that they need a pilot
hole to guide the cutter, so the disk comes with a ~6mm hole on the
centre (so they're more like a giant MDF washer). This may or may not be
a problem depending on what you need the disks for.
andy wrote:
There are a few drill bits I have seen for cutting circular holes in
wood and plaster board.
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