And if you do buy one or so of these don't forget to buy extra bits because if your like me (in my younger years)you'll either lose them or bust one!
The reason I posted this was because there is a old limestone out cropping close to my home and they cut slabs and blocks out for Fort Bellefontaine Military's building during the Civil war and there still are some bits stuck in the rock!I've never gotten one stuck.... and it only took two hours to get it out. :-)
Joanne