I was watching some videos about splitting granite and decided to give it a try. I have many in my area. These wedges worked great! I need more so I can share the larger parts. Just make sure you have a 9/16 carbon drill (I have this and it works great with an SDS punch) https://www.amazon.com/gp/product/B00B4T1GBI/ref=ppx_yo_dt_b_asin_title_o03_s01?ie= UTF8&psc=1 And as suggested by others, use a compressor to clean out the holes before inserting the gaskets. I set mine to 10lbs of pressure so it doesn't hit the dust too hard in my face ;)