These are used cutter heads for the Townsend/Bee Line fabric cutters.
These cutter heads come in various sizes, with each number representing the width of the resulting fabric cut (e.g., #4 - cuts 4/32" width strips and #8 - cuts 8/32" width strips).
Because these are used cutter heads they are available while supplies last and may contain cosmetic blemishes consistent with age and use.
