FLK Tech 5/8" Plug Wedges and Feather Shims Concrete Rock Stone Splitter Hand Tools 16mm (8, 5/8")

These worked wonderfully splitting concrete. I had previously tried using them on a large granite boulder and it seems to split off in layers layers. For that Dexpan worked better but takes a couple days. 1. Snap some lines across whatever you want to split. 2. Mark up where you want the wedges and spread them evenly across what you want to split. I placed one ~ every 6inches. 3. Hammer drill 9/16" holes deeper than the wedges, as it's hard to clear out all the dust and you will lose depth. 4. Place the wedges in the holes. Use a small handheld sledge and give each wedge 2 taps, going down the line, the 2 taps on the way back. Go back and forth until the concrete starts to split. It can take a little time for the hairline crack to start to show. Keep going until the concrete spreads and you get a gap...but don't pound the wedge to the surface. **Don't drill 5/8 in holes. You could but the wedges may go to low. 1/2" holes could work on thinner concrete, but are a bit too small and you may bend a wedge.

Used them to fracture a large block of concrete. Used a 5/8" drill bit for foot deep holes. Tried a 1/2" drill and they do fit snugly, but I don't recommend that because it caused me to bend one of the feathers. The big O Ring that holds the wedge and feathers together is nice, but keep spare o rings because they get beat up and are a consumable. The wedges do mushroom and chip from the hammer, so wear safety glasses. Mushrooming happens.

Durable and super easy to use. Only problem was 2 of the rubber rings were broke upon arrival but just went to parts store and got new ones (less than a dollar) but work great!

I wish I knew about these sooner. I’ve used them a bunch since purchasing. Still holding up.

Great value for the money and they work just fine. Just take precautions regarding the large amount of dust the drilling of the holes will create - a normal issue with using a hammer drill on stone or concrete. I was able to trim back some ground level stones of a rock wall that were a hazard to my lawn mower without disrupting any parts of the rock wall. Attempts with hammer and chisel did not work well, but these wedges and feathers worked perfectly, and those stones were really tough.

Splitting rocks sounds like some mystery, but it's not. Use a hammer drill and 5/8" bits, drill holes about 8" apart, tap these in with the feathers facing the direction you want it to split. Slowly keep tapping to increase pressure and the rock should split. If not, drill holes in between and add more wedge and feather sets. For a cleaner split line use a chisel to make a line between the holes before you tap the wedges in.

Works great amazing value but is kinda short but will do medium sized rocks easy to use

Took care of some half buried boulders. Rubber o-rings don't last too long but I wasn't expecting much from those. Solid steel can take a beating. Was very impressed with the size of the boulders I was able to break up.

We are using these wedges and feathers in our historical copper mine to clean and transport larger rocks, and they work really well. The quality of the elastic band is really good, and they last.

They work great ! I drilled holes in my 4 inch thick block of ciment, placed the feather wedges for concrete inside the holes, hit each of them one after another a few times with a hammer and the crack appeared. Very happy with my purchase !!

These chisels were used to spoilt and rough shape a chunk of igneous rock retrieved from the costs, to make a natural looking but small base for this bronze sculpture. The rest of the rock is in the back right of the first photos. If the same company makes polishing tools we would like to know! Would order some of those too.

Worked awesome. Super pleased with the purchase. Made getting rid of old slab concrete so much easier. Definitely would recommend.

They look good. Can't wait to try them this summer.