Three-jaw micro chuck. This self-centering, three-jaw micro chuck is ideal for holding small projects from the inside or outside. Its step jaws reverse for extra versatility. Its small diameter provides a safety feature, keeping your knuckles away from the jaws when working closely.
Will fit lathes with the following spindle thread sizes (this is not a morse taper) :
3/4" x 16tpi
1" x 8tpi.
Pin jaw grip: internal: 3/4" to to 2-1/2", external: from 0" to 1-1/4".
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