This is the 1" collar that is used on the label roll mount for the Take-A-Label dispensers. You will also need the Unwind Hub Thumb Screw (Part 26002) that is sold separately.
Commonly Lost Parts
If you are replacing this component on a Take-A-Label TAL-250 or TAL-450 dispenser (trip wire & photo eye), you may also want to review these other commonly lost parts:
Each machine also requires the correct waste wind clip:
Verify whether you have a TAL-250 or TAL-450 dispenser before ordering a waste wind clip, since each clip is specific to the machine width.