This looks like it contains a referral code to me, but the poster has said that it doesn't ….. any clarification please? I don't really know a lot about how amazon works.
http://www.amazon.com/Beltopro-Belt-Puncher-Round-Holes/dp/B…
I've replaced a couple of digits with hashtags
Are you suspecting "ref=sr_1_4" is a referral code? That's an Amazon internal referral parameter.
Roughly breaking down the URL, it looks like the poster
Most of that URL is unnecessary internal Amazon stuff, tracking how the user got to that item.
The only important part for sharing is the item code, eg:
http://amzn.com/B00CE5X50G