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6-inch inner diameter (10.1*15.2) 7-inch inner diameter (12.7*17.8) 8-inch inner diameter (15.2*20.3) 10-inch inner diameter (20.3*25.4) 16-inch inner diameter (30*40) a4 inner diameter (21*29.7) square 8-inch inner diameter (20.3*20.3) square 9-inch inner diameter (23*23)

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