well boys i got an iris chain from a mate who had a wrecked fizzer i snapped the clip on the masterlink and when i showed it to the local breaker he told me it was a 520 as i couldn't identify it so i went and ordered a new 520 masterlink on ebay it arrived this morning but it doesn't match up. I'm hoping someone here has had one of these chains on their 250. So question is what type of iris chain would fit the 250 3ln? It,s not the 520 that i,m sure of.