I have a set of taper tools that I bought years ago from Don Brown archery. They look just like yours only they are all white. Made by same company? I bought the set because one of the adapters is for 3/8 shafts.
I also have one of those Broadhead sharpeners. For those of us who can not afford to collect bows the accessories are a way to reconnect with our younger days.
Great stuff!,