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

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.

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

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!

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.

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.