The shale may affect water chemistry, so will check that first with this coarse cut…but also have to get a finer screen of it to know if it is good for the trees texture-wise. This cut could be used as coarse base layer for drainage, but not much more.
I bought these in 2018…but they must have been more like $70 then. You can buy them individually too. I would maybe just get a 1/4” and 1/8” set for $50 as those are the crucial sizes for bonsai soil.