Product name: Deep groove ball bearing Bearing el: 628Z Material: metal Color: sier tone Weight: 18g Closed with 2 metal covers, a shield on each side to protect the bearing from dust or any contamination. It is commonly used for electric motors, wheel bearings, agriculture, conveyors and much more. Inner diameter: 8mm / 0.31 inch; Outer diameter: 24mm / 0.94 inch Width: 8mm / 0.31 inch Package Content: 1 x Deep groove ball bearing Only the above package content, other products are not included. Note: Light shooting 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.