This worked great! I would recommend it if you need to roughen a concrete surface.
I used this "Bushing Tool" to smooth out the bottom of the basin to better manage the flow of the spring water into a pipe. The tool suffered no damage working on sandstone in a wet environment for a few hours. I recommend this!
This bushing tool was a direct fit for my hammer, its size sds max. It is well built, one solid piece, which seems like it can take abuse. Quickly made indentations on Cement, which I needed to make it less slippery. Overall, this tool is exactly what I needed, it appears durable. I recommend it.
I've only used it for one project but this bit made it very easy to break up some old concrete curbing. The curbing was broken off from the rest of the curb and had rebar stuck in it. This bit made short work of breaking apart that concrete.
Fits good in the sds max rotary hammer. I used it on limestone to remove knobby protrusions while dry laying stone. This tool will turn a limestone bump into crumbles with good control. However, I did break the rock sometimes when it was small or thin but for thicker material, it works good. This tool is hefty and seems well made. Should last a good long time.