As title says these filters fit the Olight Seekers.
They are 34mm.
So do the Olight m20 filters.
It's near impossible to actually get dimensions on Batt. Junction, so I took a chance.
I use filters for both light dispersion characteristics, and to protect the light head.

These diffusers are fairly impressive I must say even though they take away quite a bit of light throw but it really makes up for anything that may be within a good up close distance with your light rather you face your light or aim it at something is very good illumination and just about the same if you just face the light upwards, these are some of the best diffusers I have found besides Fenix and some others of course.

Fits my EC25 perfect. Genuine Nitecore product. Great light diffusion. Looks like you have a lamp on.