First impression steel collars and good thickness. It's more than I expected. Kit is heavy. Lots of size options. As mentioned in other reviews use grease on threads and thrush bearing washers. I will update my review if it's junk. But so far for the price looks like a great kit for the money. It takes allot of time to make these pieces on a lathe or find at the hardware store. Probably money well spent. Probably useful for many jobs.