Our local golf course is in the process of setting up tee boxes for the super senior ladies. The club manager asked if we could come up with tee markers. After a little back and forth, here's the result:
The tee markers are 8" diameter 1/4" thick steel plate with 1/2" diameter 8" steel spikes and a powder coated finish.
Please reach out with requests if your club/course would like something similar.