ELECTRICIANS' TIPS - SMALL hole to BIG hole using a double hole saw

A common problem - how to enlarge an existing electrical knockout. In this example, we enlarge an existing hole from 25mm to 64mm

We use a Mandrex hole saw with a special hole magnifier adaptor which allows 25 and 64mm hole saws to be used simultaneously.

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Featured in this video

Mandrex 8 Piece Electrician Hole Saw Kit
http://hub.efixx.co.uk/mandrex-holesa...

Mandrex Cooling Gel
http://hub.efixx.co.uk/mandrex-coolin...

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