This is a replacement part for the Carson Aspire 100-Inch 16:9 4K/8K Manual Pull-Down Screen from Digital Cinema (https://www.digitalcinema.com.au), which is an excellent projector screen.

I purchased the screen and unfortunately the spacers were missing on the right side of the pull-down bar due to a small manufacturing oversight. The spacers hold the screen in place. As a result of them missing, the screen wasn't firmly fixed to the pull-down bar, but there was some movement.

Note that originally the screen comes with two spacers that are each 3mm thick. The replacement part is a single spacer of 6mm thickness, which I think works better.