Review on Diamond Concrete Drilling Archer USA by David Stewart

This core drill worked great for my application installing a mini AC split system. I had to drill through some walls that were concrete and plaster over the adobe walls. I also had to drill through sandstone and that worked great there too. This ensures clean entry and exit despite the hard but brittle materials. The only caveat I have is that when I rented a drill from my local rental store, Home Depot, I needed an adapter in my case. Since Home Depot didn't provide this, I had to purchase it separately. Also remember that if you rent a drill, you need to know the end of the job. BI to BS in my case with a Hilti DD-150-U. My cost was half the price compared to buying a drill that connected directly to the drill.