Product name:624ZZ Ball BearingProduct Features· Product Name : Deep Groove Ball Bearing;Type : 624Zz· Main Material : Metal;Inner Diameter : 4mm/0.16"· Outer Diameter : 13mm / 0.51";Thickness : 5mm/0.2"· Weight : 31g· Package Content : 10 Pcs x Deep Groove Ball BearingsProduct DescriptionSingle row deep groove ball bearings. Have 2 metal shields to protect the bearing from dust or any possible contamination. These bearings are pre-lubricated with grease.