"Dave" wrote in message ...

On Mon, 12 Dec 2011 13:31:01 -0800 (PST), jtpr
I have these and they are indispensable.
http://www.veritastools.com/products/Page.aspx?p=66

I always wondered. What are the holes for in the 123 block?
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Clamping for fixture use. Often the holes are threaded for this purpose.