This bearing has Shield on both sides, Non-Connected to the Inner Ring to Protect the Bearing from Dust or any Possible Contamination. Bearing is Pre-Lubricated with High-Quality Grease ideal for use in High and Low-temperature settings (-20C to +160C). If your Application Requires a Ball Bearing with One Shield or Opened Without Shields, you can easily remove one or both Shields. - Specification: Item 6004-ZZ, Bearing Type Deep groove ball bearing, Bore Diameter 20.00 mm, Outside Diameter 42.00 mm, Width 12.00 mm, Dynamic Load Rating Cr 9950 N, Static Load Rating Cor 5000 N, Limiting Speed 19000 r/min, Clearance Normal, Tolerance Inner Ring 0 to -10 μm, Tolerance Outer Ring 0 to -11 μm, Tolerance Classes P0, Noise and Vibration Z1V1, Closures Shield on both sides, Lubrication Type Grease Shell RL2, Lubrication Temperature -20°C to +160°C, Rolling Element Indicator Ball, Material Gcr15, Product Weight 0.069 KG.