Reliable Quality,High Precision,Prompt Delivery,Good Service SERIES:H719/HQ1,H70/HQ1 series718,718,70,72 seriesH719,H70 seriesB70 series,760 series,NN30 series2344,2347 seriesYRT seriesPRECISION:P4,SP,P2MATCHING TYPE:DB(back to back)DF(face to face)DTTBTTFTQBCQBT high precision angular contact ball bearing