0-3/8" Albrecht, Germany, this is a high quality, PRECISION chuck, would be Ideal for a small drill press or in the tail stock of a small lathe, mount is a #33 taper, new cost for this is well over $200, if you need an arbour add $15 for a new Jacob's #1 taper or a #2 German taper. More deals when you click on toolguy.