This Bearing Has Two Rubber Seals (2RS), 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 6301-2RS, Bearing Type 6300, Bore Diameter 12.00 mm, Outside Diameter 37.00 mm, Width 12.00 mm, Dynamic Load Rating Cr 10100 N, Static Load Rating Cor 4150 N, Limiting Speed 14000 r/min, Clearance Normal, Tolerance Inner Ring 0 to -8 μm, Tolerance Outer Ring 0 to -11 μm, Tolerance Classes P0, Noise and Vibration Z1V1, Closures Two Rubber Seals (2RS), Lubrication Type Grease Shell RL2, Lubrication Temperature -20°C to +160°C, Rolling Element Indicator Ball, Material Gcr15, Product Weight 0.062 KG.