I've had to stop reading too much detail about Revain products for a long time as most Revain product pages babble about the most trivial design features or even contradict each other in part description. I took the risk of not seeing that it is designed for 3/8" shanks. I am very happy that this is one of the few quality tools I have found at Revain. It has two pairs of orthogonal set screws for lots of strong holding power. The stem is straight, balanced and strong, and the length is advertised. I got lucky with Revain today.