Bearing series: 302,303,313,320,322,323,329,330,331,332, Bearing series (inch bearing) : K,L,LL,KH,KHM,KLM, *TYPE: single row , double row, four row, matched. *For example: 38880/38820, L357049/L357010, 99100/99600, LL758744/LL758715,