This is a design to replace the fine line cursor in a Kreg Stop assembly. See here for the stop assembly:

https://www.amazon.com/gp/product/B0002QZ4W6/ref=as_li_tl?ie=UTF8&camp=1789&creative=9325&creativeASIN=B0002QZ4W6&linkCode=as2&tag=jcg07-20&linkId=75fe3a6a4ccb5696e8db55d5957dd053

This cursor can slide in to the cavity in the Kreg Stop and offer fine adjustment for spacing from the blade on your measuring tape. Once adjusted, it can be locked in to place by gently adjusting the screw.

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