Wedge and Feather Shims Concrete Marble Granite Rock Stone Splitting Hand Tools (5/8", 10Pcs)

I've split a lot of granite with these and they hold up well. Drill your holes deep and listen to your rock. It will tell you when it's going to break.

first time use I had no problem splitting a stubborn boulder on my backyard. very easy to use, works as intended even for a completely newbie like myself.

I have a property full of rocks and these have been the best way to reduce the big ones to move out of my way. I tried the demolition grout method but it takes too much time, effort and money. These are simple to use and don't break the bank or the back!

Worked well. Broke up a bunch of boulders without too much fuss. The rubber o-rings are a nice touch to keep things together when your fingers are shaking from having run the hammer drill, but those o-rings deteriorate after a few missed hammer hits (my fault). Still, a great idea and they worked well for me.Advice: if you have a bigger section to split, then maybe buy two full sets. At one point I had all of them pounded in (probably didn't drill them close enough to each other) and had to pound away at the rock with a sledgehammer to get those cracks to split all the way. A handful more of them would have made life easier.As for size, I think this is about the biggest I would get, because any larger moves you into expensive bits and drill hardware and much heavier work. I broke maybe 12 cubic feet of granite out of the yard where the Earth was poking through the grass in a few places. Took a few days but these did the job and are still very usable. Wish I bought more though.

They work great. I had my doubts but I've broken up 3 large rocks now with no problems.