17287-2RS Sealed Ball Bearing with Si3N4 Ceramic Balls, bearing is made of Chrome Steel with Ceramic Balls (Si3N4),17287-2RS bearing is closed with rubber seals to protect the bearing from dust or any possible contamination,bearing is sealed and self lubricated,17287-2RS bearing is lubricated with grease.

• Item: 17287-2RS Ball Bearing
• Type: Deep Groove Ball Bearings
• Cage: Nylon
• Clearance: C0~C3
• Closures: Non Contact Rubber Sealed
• Balls: Silicon Nitride (Si3N4)
• Inner/Outer Rings: Chrome Steel
• Lubrication: Pre Lubricated (Kluber NB52 grease)
• Dimensions: 17mm x 28mm x 7mm/Metric
• ID (inner diameter)/Bore: 17mm
• OD (outer diameter): 28mm
• Width/Height/thickness: 7mm
• Size: 17 x 28 x 7 mm
• Quantity: One Bearing
• Made for bicycles