Features: Made of high quality steel material, resistant to corrosion and rust, durable in use. It features high accuracy, stable performance, long service life and high reliability. The double-sealed ball bearings provides a better running environment for bearing balls. Deep groove raceway with single column ball bearing ensures the efficient operation of steel balls. Fine workmanship, exquisite mechanical design and smooth surface provide excellent mechanical properties. Specification: Condition: 100% Brand New Item Type: Bearings Holder and Its Material: Steel Plate Use Characteristics: High Speed Uses: General Number of Rolling Body Column: Single Column Raceway Type: Deep Groove Raceway Bearing Material: Bearing Steel Rolling Body Type: Ball Angle: 15 Degrees Sealing Cover: Double-sided Seal Rolling Body: Steel Ball Model: MF126ZZ, MF137ZZ, MF128ZZ, MF148ZZ (optional) Size (Inner Diameter * Outer Diameter * Thickness): (optional) MF126ZZ 6x12x4mm: Approx. 6*12*4 mm / 0.2*0.5*0.2 in MF137ZZ 7x13x4mm: Approx. 7*13*4 mm / 0.3*0.5*0.2 in MF128ZZ 8x12x3.5mm: Approx. 8*12*3.5 mm / 0.3*0.5*0.1 in MF148ZZ 8x14x4mm: Approx. 8*14*4 mm / 0.3*0.6*0.2 in Package list: 10 * Bearings Note: 1. Please allow slight error due to manual measurement. Thanks for your understanding. 2. Monitors are not calibrated same, item color displayed in photos may be showing slightly different from the real object. Please take the real one as standard.1Made of high quality steel material, resistant to corrosion and rust, durable in use 2It features high accuracy, stable performance, long service life and high reliability 3The double-sealed ball bearings provides a better running environment for bearing balls 4Deep groove raceway with single column ball bearing ensures the efficient operation of steel balls 5Fine workmanship, exquisite mechanical design and smooth surface provide excellent mechanical properties