The bh's on the aluminum shafts are Hoyt chuck-its. I believe they were only made in 100gr. I bought 15 of them about 1985 and killed the first deer in my area with one. Went on to kill 17 additional deer over the next 5 years using them. Surprisingly I never had even one of them fail. Always got pass throughs, unless stopped by shoulder, but never had a blade to bend or break.
Hard to believe when looking at how they are made. Still have 14 of the heads. Used them with 55 and 65# Kodiak recurves.