10 Packs of Heavy Duty Wedge and Feather Shims, Abuff 5/8 Inch Plug Shim and Wedge Concrete Rock Stone Splitter Hand Tools

Works beautifully.... hardest part was drilling holes to seat the wedges...

with a 3/4 drill bit, 20 of these, and a hammer i have broken about 20 large boulders in my yard. they are durable and work well, and the price is good too. they are a little pricey, but they are made of good steel and well worth it, and i don't see them breaking any time soon. put a little grease on them, where the surfaces touch, and there is basically zero wear.

Like the other comments say, the rubber manages to easily get in the way and break. Not too much hassle, however, as you can line them up by hand before using.

Used to break up very large boulders that previous homeowners had buried in the front yard to fill in voids. Drilled several holes into them with an SDS and then drove the wedges in. We thrashed on these things with sledges, hammers, and the back end of splitting mauls and they took the beating and still look almost new. Highly recommended.

I wanted to split a some thicker rocks to be thinner to be able to use as cap rocks for a rough wall. This tool can be used for this purpose. You will get the best splitting with harder rocks than with softer rock. You need to drill the holes deep enough to coerce the rock to crack in the way you may want. In my case I used a Milwaukee 12" long x 5/8" dia concrete bit and was mostly successful in cracking a number of single rocks to get two flat rocks out of each original rock (each split rock being about half the original rock thickness). The image shows a very nice split. Clever tool...

They work very well. But your description is missing the information on the O-ring. After some use they break with the rough treatment, and that’s expected. However, you don’t list the size or number of the O-ring. You should also sell them separately for just this reason. I’m having a hard time finding replacements. This is why the lower rating.

OK, so after years of banging up my mower deck hitting the top of this boulder that was sticking out of my yard I decided no more! Picked up a $90 HF rotary hammer drill and got to work. ~25 6” holes later (20 min total) And I was ready to tap in the wedges. It was amazing how easy and how little effort you have to put behind hammering these in. I used a 3 lb sledge. A few minutes later and the sweet sound on the rock splitting apart. Would definitely buy these again…great deal for 10 wedge/feather sets!One of the rubber o-brings broke but that didn’t affect how these work. Can prob pick up a replacement for a few cents at the hardware store.

After pre-drilling and pounding in the wedge and feather shims, a 4-inch-plus thick sidewalk easily and cleanly split apart. Didn't see a need for the bands holding the pieces together (many wedge and feather brands don't even include them), and once you put the shim parts into the drilled holes, they're fairly tight and stay together without the bands. Some fell through the holes as the concrete started to give, but after lifting out the chunks of concrete, I was able to track everything down.