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

Works great on boulders that were to heavy to move. the hard part is drilling holes into the rock, however sweges work great.

It helps to watch an online video of how to use the wedges and feathers.Get a good 5/8" 2-4 cutter (Star) masonry drill bit to make things go quicker. Do yourself a favor and use at least a SDS Max hammer drill.Space the holes a maximum of 6" apart. The deeper you make the holes the better they will work.Use a single firm tap on each of the wedges in the line of wedges with a 3 pound hammer (bigger is not always better in this case) and give them a chance to work. Work back and forth on the line and listen to the rock break Pounding on a single wedge tends to be a waste of effort.A magnetic pickup tool helps to retrieve any wedges or feathers that fall in the hole.Worked well for me breaking up a 8-12 inch unreinforced concrete slab and some 3-4 foot diameter granite Bolders

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.

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!

These are effective but the o-rings are crappy that hold them together. I had to keep taping them together with electrical tape. Would have been 5 stars with better o- rings.

These work like a charm!Items needed:1. Feather and wedges2. Sledgehammer and regular hammer for tapping in3. Rotary hammer drill4. 2-4 good Concrete hammer bitsAnd help lighting your boulders out. These work 1000%If you can see or find the rock veins great, if not these still work great.Drill holes about 4 to 5in apart in a line , try and grab a side one too, not required, and then tap wedges in. Work down the line then back and then sledge drive them as the get down - then boom - your rock is split. Easy day.

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.

The concept of these devices is that they split rocks by applying pressure from the inside going out. These wedges are small but can exert an amazing amount of power. On small granite rocks (less than 3 feet in diameter) buried where I had to dig a trench they easily cleared the ends of boulders. On larger boulders the effect was not as clear cut (pun intended). With one boulder where a path was to go, the top 11 inches of it were in the way. The feathers/wedges were able to break off dinner plate sized pieces 1 to 3 inches thick. This particular boulder is at least 5 feet across and goes down as far as i wanted to dig. Chipping off the top of this rock was/is the easier way to go. Drill 5/8" holes about 4 inches apart and insert the wedges. Tap them with a good sized hammer (at least 20oz.) and work around the wedges from one to the next. They work better when they all are engaged equally. They will make a ringing sound when they are well seated and hit with the hammer. When the ring turns to a thud you have cracked the rock at that point.Breaking a really big rock would require enough wedge/feather units to go across the diameter in no more than 4" spacings. More holes and wedges make things work better. I'm not sure how big a rock/boulder these will break. I have used other methods for large boulders (pickup size) but they require expensive equipment and chemicals ( rock splitting compounds)