Bearings D(mm) D(mm) B(mm) Weight(kg) RN309M 45 86.5 25 0.56 RN307M 35 68.2 21 0.32 RN305M 25 53 17 0.12 RN207M 35 61.8 17 0.22 ========== High-concerned chemical : None Material : Bearing Steel Model Number : RN309M