1. High Grade Quality Material: These Metal Flanged Ball Bearings adopt with high quality bearing steel material, which is enough for long-term use, at the same time, it is designed with a polished smooth to provide a high efficiency with a low noise during working, no worry about rusty and 2. Double Sealed for Long Term Service: These Flanged Metal Steel Ball Bearings are designed with double sealed/ shielded to protect the bearing from dust, water and foreign matter or any possible contaminants invasion, and it can keep lubricant in for a long time use as well, saving a lot 3. Multifunctional Flanged Ball Bearings: There comes with totally 10 pieces of Flanged Ball Bearings in the package, which can be used for of different projects, you can keep them for spare or just use them to replace the old , very easy and convenient. And they are applicable to mechanical equipment, electrical instruments, toys, doors, and etc 4. Suitable Size: These Flanged Metal Shielded Ball Bearings are great for 8mm shaft/rod projects with it's compact size,Suitable size for different projects 5. Excellent Performance: These Flanged Miniature Bearings feature with strong driving capacity, high endurance and high precision bearing balls for assembly line. It can be applied for high speeds and supporting both radial and axial loads that needs high running accuracy at high rotational speeds. Specifications: Flange Diameter: 18mm / 0.7inch colour: silver Material: steel size: 8 x 16 x 5 mm Package Contents: 10 x Bearings Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.