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Pretty small, you may have to use a model makers chuck/drill as the 1/32 was too small for my big drill. The higher speed also makes neater holes. I think you could make jets out of any thing like a plastic rod etc stuffed up the pipe and drilled out. I use the goof plugs from B&Q used to block their water piping and then just drilled out they fit tightly inside the algarde hose.
heres the easy way, remember where you first saw it