R8 Full Complement Ceramic Silicon Nitride Ball Bearing, the inner diameter is 1/2" inch, outer diameter is 1 1/8" inch and the width is 5/16" inch, Bearing is made of Silicon Nitride Ceramic.

• Item: R8 Ball Bearing
• Type: Full Ceramic Silicon Nitride Ball Bearing
• Balls: Si3N4 Ceramic (Silicon Nitride)
• Cage: No Cage
• Inner/outer races: Si3N4 Ceramic (Silicon Nitride)
• Size: 1/2"x1 1/8"x5/16" inch
• Inner Diameter: 1/2" inch
• Outer Diameter: 1 1/8" inch
• Width: 5/16" inch
• Quantity: One Bearing