Features 100% brand new and high quality. Made of bearing steel material, durable to use. Simple structure with stable performance, easy to use Low frictional resistance and high speed Can be used in gearboxes, instrumentation, motors, household appliances, internal combustion engines, transportation vehicles, agricultural machinery, construction machinery, construction machinery, roller skates, yo-yo, etc. Specification: Model: 6301-ZZ Cage Materials: Steel Plate Bearing Material: Bearing Steel Use Characteristics: High Speed Using: General Number of Rolling Body Columns: Single Column Raceway Type: Deep Groove Raceway Rolling Body Type: Ball Angle: 15 Degrees Sealing Cap: Double-Side Seal Rolling Body: Steel Ball Inner Diameter: Approx. 12mm / 0.5in Outer Diameter: Approx. 37mm / 1.5in Thickness: Approx. 12mm / 0.5in Package List: 10Pcs Deep Groove Ball Bearings Package List