Yup, the 4 1/2 is 7.5 open spread. My preferred wolf trap is the Koro no 9, with a 9 inch spread. They are quite expensive though, so I only have a half dozen. After the Koro my second choice is the 4 1/2. I find it to be a much better trap than the mb750s, at least for my conditions. Most of my wolf traps have a 7 foot chain attached to a 3 prong grapple made from 3/8s mild steel. The traps on the lake however I will often anchor by freezing a couple feet of the chain in the ice.
