uxcell 12mm x 4mm x 4mm Shielded Sealed 604 Motor Deep Groove Ball Bearing 10 PCS Product Name : Deep Groove Ball Bearing;Model : 604 Outer Diameter : 12mm/ 0.78";Inner Diameter : 4mm/ 0.16" Thickness : 4mm/ 0.16";Materal : Metal Main Color : Silver Tone;Weight : 24g Package Content : 10 Pcs x Deep Groove Ball Bearing