1,CF530wheel and pin bearing,also is our typical series. 2,the inner diametre from 4 mm to 35mm is our scape 3.the precision is international standard 4,we can accept nonstandard parts 5,the nut is silvery, and pin is balck normal 6.the detail data please visit our website 7.any question that we can help,tell me please. 8.welcome inquiry.