A 2117 insert will work in them, Roy. The Bear Metrics all had the same inside diameter as did the earlier Magnim series. The 2117 is not EXACTLY the same size as the original insert but they will work just fine-not quite as tight, but close. I guess I'm the friend Murray mentioned. These arrows are probably the equivelant of the 8.6 Metric Magnum at those numbers. This shaft is made of the old 24SRT gamegetter shaft- the Metric Magnums were X7- at the time, the highest grade Easton aluminum. They ran a hair stiffer than the Hunter series. Grant