1.We are professional bearing manufacture and trade company. 2.Bearing materials: Chrome steel/GCr15 3.P4.P5.P6.P0 (ABEC1/3/5) precision bearing specifications: 1) Shield / closure: open bearing, Z, ZZ, RS, 2RS 2) Snap ring: N, NR 3) Tolerance codes: ABEC-1, ABEC-3, ABEC-5, ABEC-7 4) Vibration level codes: V4, V3, V2, V1 5) Internal clearance codes: C2, C3, C4, C5 6) Material: AISI52100, AISI440C ...