I’ve used this a few times and it work great. Wasn’t expecting much for the price but has worked well for breaking concrete and clay in the ground. I was expecting plastic crap but it’s a solid little breaker.
Came with no instructions. You have to add oil and pull pin to install hammer bit. Then you have to lean on it to keep impacts going. Even with these little problems , it got the job done. Four piers are now rubble.