As a result of my tests, I determined that this hammer drill is a must-have for industrial and scientific applications. The variable speed control allows for precision drilling, and the hammer function is great for tough materials like concrete. Plus, the ergonomic grip makes it comfortable to use all day. However, the corded design can limit mobility on some job sites. Overall, this drill is a great addition to any tool collection.
Pros
Powerful motor and hammer action for efficient drilling
Cons
Heavier and less maneuverable than cordless models
The price of the HD420 was very attractive. I've used it for the simple task of drilling 1/2" holes about 1" deep in the CMU wall before inserting anchors, as well as 4" deep and 3/8" holes in concrete pavers for anchors The HD420 made the task easy.Even though I'll never use it again, it was a steal.