6 pcs stone divider and 1 pcs rotating hammer drill wedge and feathers wedges concrete marble granite rock stone splitting hand tool

I read some reviews that these were not up to the task. They fully exceeded all my expectations. Here is how I was successful using these to break up concrete.First, be sure you drill your holes far deeper than these wedges. Use the proper diameter drill bit. For the concrete ranging from 4 inches to 6 inches thick, I did holes 4 to 5 inches apart.Assemble the three metal pieces with the heavy rubber washer. Barely engage the actual wedge. This lets you drop the assembly almost completely into the hole. I also tapped both outer sleeves down as far as they would go, just tapping them.Then, using a single-jack, start tapping in each of the wedges. You will hear it and you will feel it as they bottom out. Just keep working back-and-forth from one to the next. You will quickly see a crack forming from hole to hole.When you drive the wedges down, don’t keep bashing them. If you have reached the rubber washer, it is time to stop.It is critical that you have a gap on the away side of the piece you are breaking off. There must be some place for the waste to move into as you are driving in those wedges. I still had to pry the slabs away. In fact, I used my single-jack to break the slabs apart once they broke off. It made it easier to work them out of their nest.I did use a drop of three-in-one oil on each of the three parts. Just seems to help them not get bound.Like any tool, you must treat them as they are designed to be used, and you must not abuse them. If you try to take shortcuts and use the wrong sized hole, for example, you will definitely have problems. If you try to brute force your way into success, guaranteed you will have problems. If you bash the ever-loving snot out of these, guaranteed you will have problems.Treat them right, and you will have success.

100% satisfied

When I bought these things, I wasn't sure if this could really work.I have destroyed very large concrete rings with them.It really works and it works amazingly easy.If you search for a possibility to destroy large concrete parts - Buy it!

Using a harbor freight rotary hammer the drill bit lasted around 20 holes in a large bolder I am breaking up, which was better than expected. Switch to another similar size I had on hard after that. The wedges worked as expected and with some effort made many splits in the bolder but do show some minor deforming at the ends where hit with the hammer. Would recommend if you need to break a large stone, just make sure you have a sds bit capable tool, a pry bar and some extra bits just in case.

Les coin font bien leur job mais le me he est légèrement trop petite. Le coin on de la difficulté à rentrer dans le trou