Sherline's drill chucks are made in the USA by Jacobs. We supply a #0 Morse arbor for use in the tailstock for center drilling. The chucks are also available with a #1 Morse arbor and drawbolt for use in the headstock for drilling on the lathe or mill. They are available in 5/32", 1/4" and 3/8" sizes. Runout is .003" or less. If runout of less than this amount is required, collets should be used to hole the drill rather than a chuck.The P/N 1015 Chuck is identical in capacity to the 1010 chuck except that a #0 Morse arbor has been pressed into the Jacobs taper in the back of the chuck. It is used in the tailstock and does not require a drawbolt.NOTE: Because the arbor is pressed into the chuck, it is not interchangeable from chuck to chuck. A separate chuck must be purchased for #0 and #1 Morse use