Securely hold drill bits, pen mandrel shafts, and workpieces up to 1/2 in. diameter with this precision 3-jaw keyed chuck. Featuring an MT1 arbor taper, it installs easily into any MT1 drill press, lathe, or mill with a simple tap of a rubber mallet. This set is specifically designed for use with WEN 8-by-12 in. Mini Wood Lathe models 3420, 3420T, and 3421.