6306ZZENRTXMM Nachi Bearing With Snap Ring (C clip) 30mm x 72mm x 19mm Made in Japan 6306ZZENRTXMM Nachi Bearing with a Snap Ring, the 6306ZZENRTXMM inner diameter is 30mm, the 6306ZZENRTXMM outer diameter is 72mm, 6306ZZENRTXMM width is 19mm.