9/16" Wedge and Feather Shims Concrete Marble Granite Rock Stone Splitting Hand Tools Pack of 6 …

These wedges worked as advertised. I bought 2 sets of these as they looked the same as the other 3 sets of "MAYMII 9/16" Wedges I bought earlier. This deal you get 7 vs only 5 of the MAYMII. Let me say both these work and seem to be lasting the same, but the MAYMII wedges are a little thicker metal. I have been splitting 4 huge rocks so I can expand my vegetable garden and not have rocks to hit with the tiller and take up 100 sq ft of space. What does huge or big mean? For my instance huge means I am making "small" pieces of the rocks that are around 400lbs or less.The reason for 4 stars is that the rubber bands do break (on both sets 4 total out of 29). They are still usable just take more effort to set in the holes and you now have 3 small pieces falling when the rock splits. 9/16" is also a pain in that drill bits of that size isn't available in stores in my area. I have been using 1/2" and make sure they are drilled deep and that the wedges are set straight and even, but 9/16" work better.ADVICE and thoughts: Order more bits than you think you will need 4 didn't cut it for me. I now have 15 (I use around 24 wedges per split and have drilled over 1000 holes). Also keep the holes drilled straight and keep the holes spaced 3-4 inches apart. I pushed them wider since I only had 15 wedges and it didn't split the rock and I ordered 2 sets of these wedges to finish the split and as noted above I'm averaging 24 or so wedges per split. I also have chisels and crow bar I use to finish splits and remove the wedges. Lastly, I found that splits go better if the rock isn't still buried in the ground to add pressure to hold the rock together.

These wedges are well made. Out of the 4 different brands that I have purchased, these seem to hold up the best, the rubber rings that hold the wedge together are very durable and hold up to many uses where as other brands break after 5 or 6 uses.

I live in Hawaii on the Big island. I have a yard full of large lava rock boulders. I was told that I would have to get a large piece of heavy equipment with a hydraulic jack hammer attachment, I BIG jack hammer attachment. Lava rock, even with some 'bubbles' in it is really hard.Sledge hammers, and a large $500 Bosch demolition hammer have a hard time with this rock.I bought 2 sets of these, and have used them to split boulders 2-3 feet in diameter. I'm sure I could go bigger. The split is not always 'clean' but I'm sure I'll get better with practice. I've never had a boulder not crack.I use a very long 9/16 carbide drill, 20" or so. and I always go through the rock if I can. Holes are spaced 3-4 inches apart in a straight line.Place the shims perpendicular to the line, so as to form the crack on the line. Light taps to start. Then a bit harder. NEVER give these a hard hit. It's not needed. Go in sequence, like tightening lug nuts, or head bolts.Patience. Listen to the sound of the wedge as it's hit. Listen for the sound of cracking. It takes me 3-8 minutes to split a boulder, once the shims are placed.It's unbelievable how effective these are.One issue to be aware of. Its' very easy to lose parts 'down the hole'. This is not an issue with this particular brand, but rather with the overall design. I remove my shims after the rock has a good size crack. Use Pliers, and a crowbar to 'open' the crack a bit to pull out the shims. One or 2 shims will get locked in place by the crack wanting to close up.I am buying more of these, because I know that I will occasional lose a piece. and I don't want to be without these tools.

Looks like good sturdy items, as described.One of the extra o-rings arrived split in half. I don't want to return the entire shipment and wait again.

Have been splitting many quartz containing hard boulders and these shims are working well thus far. Other reviews mention o-rings, which are thick o-rings. You don’t need them and of course they are going to break if you leave them on while splitting rocks.

These is a great product for removing large granite rocks. First time out, I was able to break a 1000lb rock into six pieces in about 3 hours. Follow the instructions - I used a 1/2" drill bit, 4" depth, 4" apart, two strong taps on each wedge, tap in sequence back and forth. The moment when the rock splits is bliss.

I wasn’t sure what to expect for the price. These were pretty slick. Granted I was only splitting sandstone but it was way easy.

Good quality - happy to see a few extra rubber rings - they fail often

bought 10 for 30 bucks. they work very well. used them to split apart old concrete steps. fortunately there was no re-bar within. was able to split concrete 32 inches thick and 40 inches long by drilling 10 holes @ 5/8 diameter, 8 inches deep in line then drilling with a 3/8 bit down to 20 inches to ensure a straight split. the stairs were 5 feet wide so I had to cleave off 5 slabs 12 inches width. then split them down to 100 pound blocks. a lot of drilling but required only light taps to make the split. removed about 4 tons of concrete steps with these on a long weekend. stop looking for a better deal or product. theses work perfect and are hardened for long life. the trick is to keep your holes in line and perpendicular to the surface. then only light taps are needed.

I like this product. I use 1/2 inch drill bits. You want to take your time and drill the holes inline with each other. And use a heavy hammer and just tap them, listening to the pitch change. I've never tried them greased.

The media could not be loaded.  Worked very well!

Easy to use and yield perfect results