I used this to upgrade a Fystec ERCF V1, so that threw me a couple curves. First, you will need to reuse a lot of the previous hardware and fasteners. Not a big deal, but keep track of the stuff you pull off. Also it had some fasteners that weren't in the build instructions, OK. It includes 2 of some items that it expects you to use the original 6 towards the 8 total gates, like the gear sets. And includes a couple extra links to extend the previous drag chain, but they didn't fit my chain. So I made longer arm to mount the chain on, pretty easy stuff. It includes about everything needed to add an ERCT, which I don't think most v1 folks would have. This is good, except it only includes 2 608 bearings. Maybe the original Triangle Labs v1 kit had 6 608 bearings? Just odd that was the only part of the ERCT that wasn't included for all 8 lanes. But didn't mater, I don't use a ERCT. Looks like it also has everything for the Filametrix Cutter, but I didn't use it either. All in all, a pretty decent box of parts to use in tackling a project which could use better documentation in general, but if you made it through the first ERCF, it is a lot less painful the 2nd go around, and totally worth it! Much more reliable now!