Finally tested and used this drill bit. Only tried it on one type of stone, but it had no trouble going through. It attaches to an angle grinder which has m14 bolt (u could make a drill adapter from a bolt). Whilst using it on a angle grinder I used an autotransformer to reduce the speed, after it went through the stone some paint rubbed off of it and stayed on the stone, but that will most likely happen just on the first few stones. I would recomend buying as it worked real good for me.

Finally tested and used this drill bit. Only tried it on one type of stone, but it had no trouble going through. It attaches to an angle grinder which has m14 bolt (u could make a drill adapter from a bolt). Whilst using it on a angle grinder I used an autotransformer to reduce the speed, after it went through the stone some paint rubbed off of it and stayed on the stone, but that will most likely happen just on the first few stones. I would recomend buying as it worked real good for me.

Finally tested and used this drill bit. Only tried it on one type of stone, but it had no trouble going through. It attaches to an angle grinder which has m14 bolt (u could make a drill adapter from a bolt). Whilst using it on a angle grinder I used an autotransformer to reduce the speed, after it went through the stone some paint rubbed off of it and stayed on the stone, but that will most likely happen just on the first few stones. I would recomend buying as it worked real good for me.

drill hardest tiles very good product

drill hardest tiles very good product

drill hardest tiles very good product