It looks from the description and also the video, that the diameter of the rollers is 41mm. If I'm wrong and you get no answers here, a call to Cookson should verify it.
Also bear in mind that while rollers are good at hardening recently poured ingots and reducing wire and offcuts to a manageable size, the result will not be as perfect as using a draw plate, which would be the next stage.
See the recent thread Making Straight Rods, to read about a home made draw bench.
http://www.cooksongold.com/forum/showthread.php?t=9250 Dennis.
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