The spacer disk attaches the core to the reel disks on the Classic Stor Lane Reel. There are three (3) disks needed per reel. The price is per each spacer disk.
Two of the disks are placed on the outside of the larger reel disks (one on each end). The third one is located inside the core and the three retention rods go through it. This helps provide better stability. (Diagram does not show the third disk.)