| http://www.w3.org/ns/prov#value | - The diameter is set to be 2.0 mm or greater and 7.0 mm or less, in general, still more 2.2 mm or greater and 6.8 mm or less, and particularly 2.4 mm or greater and 6.6 mm or less. [0035] In stead of the circular dimples 4, or together with the circular dimples 4, non-circular dimples may be also formed.
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