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 Ball Diameter
A width of a sphere indicated by fractions of an inch. For example: " ", ". When balls are ordered by this size designation, it is the basis on which the diameter tolerance per carton and diameter tolerance per shipment applies. This diameter indication is also known as the "nominal diameter."

 Basic Diameter
A size specified by a fraction plus a decimal. For example " +.0003." When balls are ordered by basic diameter, it is the basis to which the diameter tolerance per carton and diameter tolerance per shipment applies.