I recently asked a Ebay seller what was the lengtht of the shafts on some 'rescue' / Hybrids I was interested in, and he replied they are 'Standard'? I have had 2 types in the past. A pair of Skymax 'Iron Woods' and a set of RAM wizards with Hybrids instead of a 3 and 4 iron. - The Skymax where easier to use, and with longer shafts than the RAM. Is there a standard length for theses replacements for the 3 and 4 iron? - cheers

In a word No

the Callaway 3i replacements are 40.25" and the 4i 39.25"
the taylormade 3i is 40" and the 4i 39.5"

So there is no standard length but they are all very close,with each change in loft there is a 0.5" difference in length of shaft.(4i being shorter than 3i)

Best go to the manufacturers website and check the specs or if unavailable contact them.