Product FeaturesPrecision cut for the right fitSelf-Centering and Self-LubricatingStrong material with outstanding wear ratiosConvenient and very easy to assembleAll components are manufactured and tested under stringent guidelines What is Included(1) Delrin V Wheel(2) Ball Bearings - 625 2RS(2) 5mm Precision Shim(1) Lock Nut with Nylon InsertProduct SpecificationsRockwell Hardness: M80Compression Strength: 63MPAOD: 23.90mmID: 15.974 +/- 0.026mmID Bearing: 5mm Thick: 10.23mmDelrinColor: Black