Sherline 3/8 in Jacobs Drill Chuck 3073 3/8" chuck includes a #1 Morse arbor and drawbolt (not shown) so that it can be mounted in the headstock of the lathe or mill. P/N 3073 has the same size capacity as the P/N 1069 chuck above, which is 1/16" to 3/8". (NOTE: If the drill chuck is to be used on both the lathe and mill, purchase P/N 1069 which comes with both #0 and #1 Morse arbors.)