I bought this chuck with an MT3 shank to use in the tailstock of my lathe and it fits great. It has a very nice finish, smooth turning action, great knurling and holds tools nice and tight. It doesn't come with a spanner to loosen it if it gets real tight on you while drilling, but I haven't found that to be a problem. The chuck has a big enough diameter that it's easy to turn with your hand, even when fairly tight. It's nice and solid and heavy, very stable. Works great!