Rosemary from Works Of Glass uses the Eternal Tools 4mm diamond core drills to drill holes in glass using a pillar drill, with the glass under water in a shallow tray.
"The core drills work very well I am pleased to say!"
Attached is a photo of one of her kaleidoscope's, and shows the box end object wheel which is where she has to drill the holes in glass
The bottom picture show the stunning images of the the kaleidoscope's effects.
