R8 Full Complement Ceramic Ball Bearing, the inner diameter is 1/2", outer diameter is 1 1/8" and the width is 1/4", Bearing is made of Ceramic.

• Item: R8 Ball Bearing
• Type: Full Ceramic Ball Bearing
• Cage: No Cage
• Closures: Open
• Balls: ZrO2 Ceramic
• Inner/outer races: ZrO2 Ceramic
• Size: 1/2" x 1 1/8" x 1/4" inch
• Inner Diameter: 1/2" inch
• Outer Diameter: 1 1/8" inch
• Width: 1/4" inch
• Quantity: One Bearing
• Highest Temperature: 356 (degrees fahrenheit) = 180(degrees Celsius)