Individual inserts that allow the use of 1.25″ filters in threaded cells to be used instead of 36mm unmounted filters in the FW8-8300, FW8S-STT and FW8G-STT filter wheels. (Also compatible with obsolete FW5-8300 wheels.) You can mix 1.25″ and 36mm filters in the same filter wheel carousel.
Use one insert for each 1.25″ filter.
Very useful for specialty filters that may not be available in the larger unmounted size.