TOOGOO(R) 2 Pcs Single Shielded 608Z Miniature Deep Groove Ball Bearings Product Name : Ball Bearing;Model : 608Z Type : Miniature;Material : Stainless Steel Color : Silver yellow ;Internal Diameter : 8mm/ 0.31" Outside Diameter : 22mm/ 0.86";Width : 7mm/ 0.27" Net Weight : 22g;Package Content : 2 x Ball Bearing