Loose Ceramic G20 Ball 13/16" = 20.638mm Si3N4 Silicon NitrideG20 Loose Ball Bearing 13 16" inch = 20. 638mm Ceramic Ball (Si3N4) One Ball Loose Ceramic Ball 13 16" inch Si3N4, this is a popular size that could be used in any application that uses this size 13 16" inch. Ball is made from Ceramic Si3N4. Loose Ball Size: 13 16 Inch (20. 638mm ) Grade: G20 Material: Ceramic (Si3N4) Quantity: One Ball
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