I finally broke down and ordered the midge jaws after having my peak vise for a couple years now. I was able to tie down to a size #20 ok with the standard jaws, but it was not as easy as it is with the midge size jaw. These do make it much easier to tie the smaller fly's. They are easy to change out, and they should last as long as the vise, and from my experience so far, is a lifetime and longer with little care. Great product from Peak.