This is a double duty resin Plug follower.
One end has a standard trap the other has a star burst cap cylinder remover.
This is designed for the disassembly of our practice locks.
If it is your first time taking a lock apart make sure to take your time or Springs and Pins will be Flying.
Note: It is really handy and some would say necessary to have pinning tweezers to take apart and rebuild a lock.