Having a 4-jaw chuck is critical for the lathe work I do, which uses mostly square or rectangular stock. Completely happy with this chuck. My only compliant is that the bolts included are too long to install in my Vevor mini-lathe. If I cut them down short enough to install, they are too short to hold the chuck. Not a big deal to use the 3 original studs, but the chuck has a four-hole pattern so I will have to make a fourth stud.