/ Precision Measuring Tools / Precision Hand Tools / Micrometers / Micrometer Accessories / 247D * Not actual product image 51177 247D Micrometer Ball Attachments, .200" Diameter Balls 51177 Other similar products For 216, 231, 436.1, 733, 734, 3734, 1212 and 1230 Micrometers, .250" diameter Anvil and Spindle .250" Diameter Anvils. Features Specifications Contact Starrett Features Easily applied by snapping on to end of either anvil or spindle, thus permitting two attachments to be used together Balls are hardened, measure .200" in diameter, and move freely in the retainer, insuring positive contact with anvil and spindle Ball Diameter: .200" (5mm) For 216, 231, 436.1, 733, 734, 3734, 1212 and 1230 Micrometers, .250" diameter Anvil and Spindle .250" Diameter Anvils. Specifications : Ball Diameter: .200" (5mm) Fits Starrett Series: For 216, 231, 436.1, 733, 734, 3734, 1212 and 1230 Micrometers, .250" diameter Anvil and Spindle .250” Diameter Anvils.