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: MF52ZZ, MF63ZZ, MF74ZZ, MF83ZZ (optional) Size (Inner Diameter * Outer Diameter * Thickness): (optional) MF52ZZ 2x5x2.5mm: Approx. 2*5*2.5 mm / 0.1*0.2*0.1 in MF63ZZ 3x6x2.5mm: Approx. 3*6*2.5 mm / 0.1*0.2*0.1 in MF74ZZ 4x7x2.5mm: Approx. 4*7*2.5 mm / 0.2*0.3*0.1 in MF83ZZ 3x8x3mm: Approx. 3*8*3 mm / 0.1*0.3*0.1 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.