20Pcs 693ZZ Ball Bearing 3 x 8 x 4mm Double Shielded Deep Groove Chrome Bearings
Model: 693ZZ (Inner Dia. =3mm, Outer Dia. =8mm, Thickness=4mm). 20 × 693ZZ Ball Bearings. Shields on both sides of the bearing Preserve grease and prevent impurities from entering. Suitable for high speed operation.