Laser gauge block

This is just a small 4mm block for setting the depth on my laser engraver. Mine originally came with a small metal depth gauge but I found it too hard to put under the laser head and remove once it's set.

Mine is similar to this one. With a fixed focus adjustable head.

https://www.amazon.com/Latitool-Engraver-Engraving-5-5-7-5W-Accuracy/dp/B0B244M8YF/ref=sr_1_29?keywords=laser%2Bengraver&qid=1666361978&qu=eyJxc2MiOiI2Ljk5IiwicXNhIjoiNy4wNSIsInFzcCI6IjYuNjMifQ%3D%3D&sr=8-29&ufe=app_do%3Aamzn1.fos.18630bbb-fcbb-42f8-9767-857e17e03685&th=1