L.S. Starrett 247D Ball Attachment For

• Easily applied by snapping on to end of either anvil or spindle, thus permitting two attachments to be used together
• Balls are hardened and move freely in the retainer, insuring positive contact with anvil and spindle
• The diameters of each ball used must be subtracted from the micrometer reading
• Meets or exceeds accuracy and performance requirements of national and international standards and are traceable to the National Institute of Standards and Technology.