Despite being labeled for "Industrial and Scientific" use, this lockset was a complete disappointment. Through trial and error, I found that it was incredibly difficult to install and the carbide tip wasn't as durable as advertised. The one pro was that it did fit the 2 1/8 inch hole size .However the cons were numerous - poor quality and difficult installation. i would not recommend this lockset for anyone in need of a reliable product in the cutting tools category..